Karthik's whirlwind 38-ball knock and skipper Gautam Gambhir's 43 helped Daredevils get to a challenging total of 188 for six in 20 overs.
While chasing, Rajasthan Royals batsmen faltered right from the start and their innings folded in for 121 in 17.4 overs at the Ferozeshah Kotla stadium. Leg spinner Amit Mishra picked up three for 25 and David Warner was outstanding on the field taking four catches and affecting one run out.
With their third consecutive win, Delhi moved to the second spot in the IPL with 10 points from eight matches while Rajasthan Royals are fourth with eight points from as many matches.Scorecard|IPL 2010
Image: Dinesh Karthik of the Delhi Daredevils plays a shot.