This article is contributed by Imran Khan, who you can follow on Twitter @cricketsavant.
Seam bowlers dominated the top wicket-takers list, with only Usama Mir, Sunil Narine and Mohammad Nawaz representing the spinners. However, spinners did have a lower economy rate and strike rate than seamers over the whole tournament. Wahab Riaz and Hasan Ali, who picked up 27 wickets between them, spearheaded the bowling attach for the champions Peshawar. We’ll investigate what made them successful later on.
Tournament top run getter Kamran Akmal was most destructive against right-arm spinners and medium pace seam bowlers, against whom he scored 150 runs at a strike rate of 195.
The beehive plot below shows all of Akmal’s boundaries against these types of bowlers. He rocked onto his back-foot and seized on anything marginally short from the slow bowlers or went down the track to hit over the top.
In fact, Akmal scored 55 runs from the 36 occasions he played a shot off his back foot against right-arm spinners and medium-pace seamers. He also accrued 31 runs from the 10 balls he went down the track during the tournament.
Against fast seam bowling however, Akmal was restricted to a run a ball and dismissed three times.
The heat map above is generated from his dot balls against fast seam bowlers with his dismissals in red. He was generally kept quiet by good to back-of-a-length deliveries just outside off stump. In fact, from these types of deliveries Akmal scored 46 runs at a strike rate of 90 – well below his overall strike rate of 129.
Akmal was also relatively constrained by left-arm orthodox bowling scoring at a little over a run a ball and being dismissed four times.
The pitch map above shows a distinct cluster of dots and singles (red and blue) where the bowlers like Imad Wasim and Hasan Khan pitched it on a very good length. However, on the few occasions where they bowled full or a touch shorter, Akmal would take advantage.
The talk before the PSL was of Chris Gayle’s overwhelming superiority in T20 cricket having scored nearly 10,000 runs in the format. However, he is still 63 runs short after the end of the tournament having scored just 160 runs at an average of less than 18 and a meagre strike rate of 115.
Gayle struggled against fast seam and off spin bowlers striking at less than a run a ball and being dismissed four times each.
The heat map above shows the distribution of dot balls faced by Gayle against fast bowlers with his wickets in red. Back of a length and outside off stump is where most of the dots are concentrated. This is a bowling plan that has historically kept him quiet. In fact, he scored 25 runs from 24 balls including just 4 boundaries when facing deliveries in this region.
Gayle did not fare particularly well against right-arm off spin and left-arm orthodox bowling. The heat map above shows that his dot balls generally came when they bowled very straight to him on a good length, again something that spinners have exploited previously. Of the 21 balls he faced from off spin and orthodox bowling and which were on the stumps, he scored only 12 runs and timed exactly one ball (which was hit for six).
The best bowlers
Top wicket-taker, Karachi Kings’ Sohail Khan utilised his slower ball to great effect. He sent down 44 throughout the tournament earning him six of his 16 wickets whilst only conceding a run a ball (compared to his overall economy rate of 7.61). Second highest wicket-taker Wahab Riaz fared just as well conceding just 28 runs from his 35 slower deliveries and picking up two wickets.
Sohail Khan’s slower ball was very consistent in terms of speed as the histogram shows above. Wahab’s distribution is less pronounced indicating that his slower balls were a variety of speeds, with a slight bump at 130 kph.
21-year-old leg-spinner Usama Mir who took 12 wickets for Karachi Kings, the highest for any spinner, predominantly stuck to his stock delivery during the tournament. However, he did send down variation in the form of googlies and quicker balls a total of eight times, from which he picked up three wickets and conceded only eight runs.
Mir bowled his quicker delivery more than the googly as the very slight bump in the positive spin region illustrates. Compare this to Sunil Narine who more or less bowled his variations as often as his off-break delivery – something no doubt Mir will gain the confidence to do in his career.
Every match of the tournament was played on two grounds – Dubai and Sharjah, with the exception of the final which was held in Lahore. This allows us to reliably compare the two grounds to see how different conditions may have affected team strategies.
The table below summaries some statistics for seam bowlers for all matches in both grounds. Seam bowlers enjoyed a lower economy rate in Dubai, although at the cost of a slightly higher average and strike rate.
Similarly for spinners, Dubai offered a lower economy rate by 0.5 runs an over, while their average and strike rate were higher.
We can ask whether these differences came about due to the different pitch conditions in the two grounds. The table below summarises the average off the pitch and in the air movement for seamers and spinners in degrees.
Although Sharjah offered a little more swing for the seamers, they extracted a lot more seam movement in Dubai. Dubai also saw more drift and a lot more spin.
The histogram above shows the distribution of spin at both the grounds. Both grounds are slightly skewed towards negative values of spin (indicating spin away from the right-hander and in to the left-hander). Sharjah has a much higher and narrower peak demonstrating the relative lack of assistance from the pitch for spinners.
Importance of the toss
In every game bar one the winner of the toss chose to bowl first. The table below shows the same attributes from before but separated by first and second innings.
It’s evident that the second innings offered a bit more for every factor but not significantly more – certainly not enough to convince captains to bat first.
As has become a wider trend in T20 cricket, knowing your target is advantageous enough to always bat second regardless of conditions.
The graph above shows the average worm for matches where the team batting second won the game in this year’s PSL. The green line shows that teams generally start off quicker in the Powerplay before slowing down somewhat to keep wickets in hand until the tenth over. After this they overtake the first innings worm to chase down their target in the latter overs.
Imran Khan, @cricketsavant.