Jos Buttler roared back to form with a masterful century that overshadowed Virat Kohli's record-extending 113 as Rajasthan Royals defeated Royal Challengers Bengaluru by six wickets for a fourth win in as many matches in the IPL, here on Saturday. Royals now have four wins out of four and sit on top of 10 team table while RCB slipped to eighth spot with fourth defeat and three on trot.