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Chennai Super Kings are ninth in the IPL points table with just one win in six matches.
Chasing a modest target of 152, SRH were home and dry with seven balls to spare.
Indian Premier League's most successful franchise slumping to their sixth defeat in as many matches this season on Saturday.
After six matches in this year's IPL, Karthik has an average of 197 at a strike rate of 210, and would hope to carry on his run-scoring spree to be in contention for the Twenty20 World Cup in Australia later this year.
David Warner's fifty went in vain as Delhi failed to chased down RCB's total of 189/5.
Rahul smashed nine fours and five sixes in his 100th IPL match.
Watson also criticised MI for buying the injured Jofra Archer for a huge sum.
The 22-year-old pacer from Srinagar has consistently bowled deliveries clocking 145 to 150 km per hour this IPL.
The CSK pacer was ruled out of the entire IPL 2022 season on Friday due to a back injury.
SRH chased down the target in 17.5 overs after half-centuries from Rahul Tripathi (71 off 37) and Aiden Markram (68 not out off 36).
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