IPL 2017: If April was hot, May will be hotter!

A sprint is comprised of three broad phases - drive, maximum velocity, maintenance. During the drive phase, the sprinter begins in a crouched position as he bursts from a dead still position into a sprint, and strives to make use of his entire body. In the maximum velocity phase, the sprinter is in a fully erect position and achieves top speed. Lastly, in the maintenance phase, the sprinter's goal is to minimize deceleration, as he cannot maintain top speed for the entire race. 

Sprint is an apt comparison with the freneticism that IPL represents. And like in a sprint, we've seen various IPL editions go through similar phases. Some teams, like a standard sprinter, start in the best possible manner, making best use of available resources, and try to gain maximum momentum for the latter half of the tournament. Others, like Usain Bolt, start slowly but continue to build momentum as they move to the knockout stage. Every IPL has thrown up both kinds. 

For example, at the halfway stage in IPL 2016, neither of the finalists (SRH and RCB) were in the top four. In fact, the runners-up RCB were languishing at the 7th spot. They then made a strong surge, finished in the top two at the end of the league stage and eventually made the finals. On the other hand, there were the table toppers Gujarat Lions, who figured in the top 2 almost throughout the league stage but failed to make the finals. Similarly, in the 2015 edition, Mumbai Indians, having endured another poor start, were placed 7th halfway through the tournament. Like RCB in 2016, MI too made a strong surge towards the end, finishing in the top two and eventually did one better than RCB, by winning the 2015 edition. Meanwhile, the table toppers, Chennai Super Kings, were in the top two throughout the league phase and eventually made the finals.

Nearly 60% of league matches of IPL 2017 are done and dusted. By now, the well prepared teams have settled into their winning combination while the not-so-well-prepared ones are running helter skelter to find one. Or, in sprint terminology, the drive phase is over and we are in the midst of the maximum velocity phase. The points table, which was previously getting overhauled after each match, is now seeing marginal adjustments. Hence, this is a good time to take a look at those aspects, that make up the team combinations, and have impacted the league standings so far. Basically, we look at the following:

• Batting - opening combinations
• Batting strategy
• Bowling strategy
• Performance of all-rounder
• Performance of wicket-keeper

How are the teams stacked up?

A cursory glance at the points table at different stages during the 2017 edition (see below), will reveal how certain teams have maintained consistently strong performances, certain others have made a comeback of sorts and the remaining few have slipped. 

Source: ESPNcricinfo.com

Source: ESPNcricinfo.com

Source: ESPNcricinfo.com

While Mumbai Indians (MI), Kolkata Knight Riders (KKR) and Sunrisers Hyderabad (SRH) have remained in the top 4 throughout, Kings XI Punjab (KXIP) has slipped after a good start. Rising Pune Supergiant (RPS), which has won 4 out of their last 5 matches, is now making a strong surge. So is Gujarat Lions (GL), which seems to be finally getting its act together, with key players back in form. Delhi Daredevils (DD), despite boasting of the strongest pace bowling attack and after getting off to a good start, hasn't got its batting strategy right and this has cost them a place in the top 5. Lastly, Royal Challengers Bangalore (RCB) has mostly not turned up, barring a rare good performance - RCB has consistently hugged the bottom of the table.

For the purpose of the analyses below, I've divided the teams into three categories based on their performances so far (all analyses below is upto Match no. 33, featuring KXIP vs. SRH on 28th April 2017):

• Leaders - Teams with more than 50% wins and +ve NRR; MI, KKR and SRH
• Laggards - Teams with 40-50% wins or -ve NRR; RPS
• Also-rans - Teams with less than 40% wins; GL, KXIP, DD and RCB

Opening batting combination

One of the most crucial aspects of a strong batting lineup, esp. in a T20 match, is whether the opening combination is settled or not. Successful teams typically have:

• A stable opening pair
• Opening pair regularly gets a partnership of 30+ runs 
• As a result, the team manages to score 50+ in the powerplay without losing more than 2 wickets.

Data source: ESPNcricinfo.com

* Doesn't include the RCB-SRH match that was abandoned due to rain

MI and SRH have stuck to the same opening pair for all their matches, and they've got 30+ run partnerships on 5 occasions each. While MI has scored 53 runs on an average in the powerplays (losing 2 wickets), SRH has managed only 46 runs (losing only 1 wicket). This go slow approach by SRH seemed deliberate in the first few matches, as the normally aggressive Warner assumed the role of a sheet anchor and SRH had their hitters in Henriques, Hooda and Yuvraj following immediately after the openers. This has changed in the last few matches as they've got Williamson at no. 3, allowing both Warner and Dhawan to bat a little more aggressively.

KKR meanwhile has adopted a different strategy. With Gambhir anchoring the innings, they've given the license to the other opener to go for broke from ball 1. They started their campaign with the big-hitting Chris Lynn but once Lynn was injured, they promoted Sunil Narine up the order, and the Trinidadian has delivered big time for his team (141 runs at a strike rate of 178). KKR too has a settled opening pair now, with Gambhir and Narine opening together in the last 6 matches.

RPS has used 3 openers and their powerplay numbers are more impressive than both MI and SRH. They've got an opening partnership in excess of 30 on four occasions and their average score after powerplays is 53 (losing 1 wicket in the process). While RPS first tried Mayank Agarwal alongside Rahane, they've now settled for Rahul Tripathi instead of Agarwal. Tripathi has been one of the finds of the tournament scoring 216 runs at a strike rate of 154+, so far.

GL has tried a horses for courses approach, with McCullum as a fixture at one end and experimentation with four other openers at the other. They started with Jason Roy, then moved to Dwayne Smith, had Finch open on a couple of occasions when Smith was struggling against spinners, and then, in the last match against RCB, they sent in the left-handed Ishan Kishan to counter the threat of two leg-spinners in the RCB lineup. Finch has been used as a floater while Smith has now been moved to lower middle order. GL's run rate seems to be impressive but they are still yearning for consistency at the top.

On the other hand, KXIP has a settled opening pair in Amla and Manan Vohra with Shaun Marsh tried for one match, when Vohra was injured and Guptill tried once, when Amla was injured.

Neither of the bottom two teams have a settled opening pair. DD have tried four combinations with four openers (Samson, Billings, Tare and Karun Nair) and the opening wicket still averages only 29. Lastly, the star-studded RCB hasn't got their opening pair right, having looked at 5 different openers and 5 different opening combinations in their 8 matches! Obviously, Virat Kohli's injury hampered their opening strategy but even though he's back, RCB isn't sure whether Gayle fits into their overall scheme of things. The result has been just three partnerships of 30+ runs and an average PP score of 40. It's probably fair to say that the also-rans group has been hampered due to instability or consistency at the top.

Batting strategy

Let's now take a look at the batting strategy adopted by various teams. For this purpose, I've divided the innings into the following three phases:

1. Powerplay overs - Overs 1 to 6
2. Middle overs - Overs 7 to 16
3. Slog/end overs - Overs 17 to 20

I've then looked at the average run rates of teams during these phases to understand the strategy adopted by the various teams. Looking at the phase-wise run-rates:

Data source: ESPNcricinfo.com

Data source: ESPNcricinfo.com

From the above charts, I believe it's more relevant to look at the first innings chart (for this purpose) since the run-rates while batting 2nd are driven by the target being chased. We can clearly witness the following two types of batting strategies from the above chart (first innings):

1. Start briskly, consolidate in the middle overs and then explode at the death - strategy followed by MI, KKR, RPS, DD and GL.
2. Start slowly, increase the run rate in the middle overs and continue to maximize run-scoring towards the death - strategy adopted by SRH, KXIP and RCB

The above strategy becomes evident if one looks at the batting orders of the respective teams.

Bowling combination

How about bowling combinations? While T20 started out as a batsman's game with bowlers playing supporting characters, over time this has changed. Champion T20 teams of today have very strong bowling line-ups and the captains generally have 6-7 bowling options. Let's look at the bowling combinations (pace and spin) that the teams have used so far in the 2017 edition.

Data source: ESPNcricinfo.com

From the above charts, it's very clear that KKR and RCB have relied on spin much more (~45% of total balls bowled) than the pace-heavy line-ups of DD (25%), MI (31%) and SRH (33%). KKR has played Kuldeep Yadav and Sunil Narine in almost all matches and got them to bowl their full quota; plus, they've also played Piyush Chawla and Shakib Al Hasan occasionally. RCB too has relied heavily on the spin of Chahal, Negi and Badree.

On the other hand, DD has mainly played four fast bowlers (Morris, Cummins, Zaheer and now Rabada) and after playing Nadeem alongside Mishra for the first three matches, is now solely relying on Mishra as the spin option. MI too has utilized Harbhajan as the main spinner with the all-rounder Krunal Pandya playing the supporting role on a few occasions. On the other hand, SRH has completely relied on the Afghan star, Rashid Khan, as their sole spinning option (except for a couple of matches).

One look at the economy rate comparison between pace and spin (chart below) tells us that teams should look to utilize spinners a little more.

Data source: ESPNcricinfo.com

Even when comparing bowling averages or strike rates, spinners don't suffer in comparison to the pacers.

Lastly, we also look at the no. of bowlers that various teams have tried (pace and spin), subject to certain minimum criteria. One would notice that the top teams generally have a settled line-up.

Data source: ESPNcricinfo.com
* Doesn't include the RCB-SRH match that was abandoned due to rain

Performance of all-rounders

In order to make up for one or two bowlers having a bad day (or a bad match-up against a particular batsman who's in devastating form), most IPL captains increasingly prefer at least 6 bowlers in the line-up. This makes the role of all-rounders crucial. And these all-rounders typically contribute by scoring runs briskly and keeping the runs down while bowling (economy rates are as useful as wickets in a T20 match). I've taken a look at all-rounders across various IPL teams, applied criteria of at least 50 runs scored while batting and at least 4 overs bowled. Then I've compared the batting strike rate with the economy rate (per 100 balls) and taken the difference between the two (calling this All-Rounders' Index). Eliminating the negative ARIs i.e. where batting strike rate is less than bowling economy rate, this is what we get:

Data source: ESPNcricinfo.com
* Doesn't include the RCB-SRH match that was abandoned due to rain

Sunil Narine with an ARI of +67.5 is very much the standout amongst the all-rounders and is one of the primary reasons why KKR is on top of the points table. For MI, the Pandya brothers have provided incredible balance to the side. Ben Stokes has been the talisman for RPS (as was amply on display in the MI-RPS match at Wankhede). Similarly, DD's fortunes have fluctuated with the rise and fall of Chris Morris' form. In the initial stages he set the tournament on fire, bowling with pace and taking wickets upfront, and providing the late burst while batting. This enabled DD to get off to a good start but as Morris' form has dipped, so have DD's performances. Needless to say, a good all-rounder is critical to his team's fortunes.

Wicket-keepers - key to team balance 

What about wicket-keepers, I hear many of you ask! In modern cricketing terminology, a wicket-keeper, if also a capable batsman, is considered as an all-rounder. And team managements clearly demand that wicket-keepers contribute handsomely with the bat. For almost all IPL teams (except SRH), the wicket-keeper is also a key batsman - either playing in the top order (Uthappa, Parthiv, Jadhav) or coming at the back end to get some quick runs (Dhoni, Karthik, Saha and Pant). So, it's imperative that we look at their performances from a team composition perspective. For the following analysis, I've devised a composite batting metric (called batting index) that combines the run per innings (RPI; not the average) and strike rate per 100 balls. It's a product of the two parameters; so basically, if a batsman scores 40 runs in an innings at a strike rate of 90, the batter's performance is penalized as the batting index works out to 36 (40 x 0.9). Conversely, if he scored the same number of runs at a strike rate of 125, the batting index works out to a significantly better 50.  

Data source: ESPNcricinfo.com
* Doesn't include the RCB-SRH match that was abandoned due to rain

From a batting perspective, Robin Uthappa has been the most outstanding performer with a batting index of 69.5 - far ahead of the competition. This too has enabled KKR to remain the front-runners in the current edition. Other notable performers include Jadhav and Karthik.

Data source: ESPNcricinfo.com

* Doesn't include the RCB-SRH match that was abandoned due to rain

The primary job of a keeper, however, is keeping wickets. For analyzing the keeping performance, we take a look at dismissals per innings as well as extras conceded per innings (byes which are attributable to the keeper). Here, it's the Indian test wicket-keepers (present or past) who've been especially tidy - look at the extras / innings for Parthiv, Dhoni, Karthik and Saha. In terms of dismissals / innings, Uthappa and Pant stand out, but a lot of that has to do with the type and quality of bowling line-ups that their respective teams possess.

Conclusion

In a 100 mtr sprint, most runners achieve top speed around the 60 mtr mark and they try to maintain this speed till the 80 mtr mark. It can be argued that KKR, MI and SRH are fast approaching that stage. They've ticked most of the boxes - stable opening pair in line with the batting strategy, bowlers performing their assigned roles, key all-rounder(s) identified and wicket-keeper contributing both behind, as well as, in-front of the stumps. The focus will remain on making the play-offs and possibly finishing in the top 2 (thereby securing two chances to qualify for the finals). 

On the other hand, the laggards will look to play catch up and possibly go for an all-out attack. Expect them to be more ruthless with their selections in the coming matches. They'll be less reliant on strategy, more on scrapping. And also, hopeful to do a Usain Bolt. The 8-time Olympic gold medalist is a renowned slow-starter who hits the highest velocity in the 60-80 mtr phase and then maintains this speed almost till the finishing line. Not a bad example to emulate!