He bowled the final over of the game and successfully defended 18 runs to win the game for his side.
At the end of 3.3 overs, CSK was 14 for 1 wicket and Watson has gone and Bhuvi plucks his wicket.
Despite Williamson's 51-ball 84, CSK bounced back to take wickets at crucial turns.
Needing 33 runs in the last two overs, Yusuf Pathan and Rashid Khan blasted a six each off Shardul Thakur in the penultimate over. The visiting team then stopped the hosts at 178 for six, with medium pacer Deepak Chahar doing the bulk of the damage.
Williamson told media after SRH's defeat, "I think both innings for us were innings of two halves, we certainly started off very well with the ball". Their hope of chasing it down further took a hit when Deepak Chahar (4-15-3) wreaked havoc in his first spell, removing the debutant Ricky Bhui (0), Manish Pandey (0) and Deepak Hooda (1). Kane Williamson was completely baffled it wasn't given as a no-ball which was clearly over the waist with the replays coming in. Suresh Raina 35 (32), Ambati Rayudu 61 (30), Rayudu scores his fastest 50 of IPL off 27 balls.
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Opener Dhawan, who has not let the team feel the absence of David Warner, is also at risk of missing the match as he is yet to recover from last match's injury. His five boundaries and as many sixes were a delight for the eye, for he hit them clean.
Ambati Rayudu's masterclass was almost outdone by one from Kane Williamson, but Chennai Super Kings survived that attack from Sunrisers' captain and then a Yusuf Pathan cameo to crawl to the top of the table. Dhoni, after having arrived in the 17th over, hammered a quick 25 off just 12 balls with 3 fours and a six to propel the CSK total past the 180-run mark.
Chennai might also get tempted to play Willey in place of Tahir, which will enable them to drop Chahar and bring back Harbhajan.
But he didn't get any support from his top order. They have batsmen who can play shots well up to the number seven spot. Yusuf Pathan's sterling innings comes to an end as he spoons a catch to Suresh Raina in the second last over. It was, after all, his home ground. While it wasn't easy to find runs from the length area, anything short or wide asked for treatment. Knuckle ball and the Australian is undone by the change of pace. Flat delivery and the batsman leaps forward to sweep.