Brendon McCullum struck a quickfire fifty before Ravindra Jadeja produced a brilliant spell of 4-11 as Chennai Super avenged its defeat over Rajasthan Royals with a 12-run win to virtually secure its place in the play-offs of the Indian Premier League.With this win, Chennai jumped to the top of the table with 16 points from 12 matches, while Rajasthan will continue to occupy the third spot with 14 points from 13 games.Chennai thus avenged their eight-wicket loss to Rajasthan in Ahmedabad last month.Opting to bat, McCullum smashed a quick fire 81 before Chris Morris (3/19) produced a brilliant display with the ball for Rajasthan Royals to restrict Chennai to a modest 157 for five.Chennai Super Kings’ players celebrates after dismissing a Rajasthan Royal' Shane Watson during their IPL-2015 at MAC Stadium in Chennai.