Rajasthan Royals defeated Punjab Kings by four wickets to keep their slim play-off hopes alive in the Indian Premier League here on Friday. Chasing 188, Yashasvi Jaiswal (50 off 36) and Devdutt Padikkal (51 off 30) slammed quick fifties, while Shimron Hetmyer struck 46 and impact substitute Dhruv Jurel (10 not out) sealed the win for RR with a six with two balls to spare.