Riding on Ajinkya Rahane's half century, Rajasthan Royals defeated Sunrisers Hyderabad by six wickets at Vishakhapatnam last night to notch up their fourth consecutive win in this edition of the IPL cricket tournament.Chasing a modest 128 for a win, the table-toppers made heavy weather of the run chase, achieving the target on the last delivery of the match. The Hyedrabad bowlers did well to take the match thus far but Rahane's 56-ball 62 proved to be the difference between the two sides.Earlier, Rajsthan bowlers Dhawal Kulkarni and Pravin Tambe picked up two wickets each to restrict Hyedrabad to 127 for five in 20 overs.Today in the IPL, Mumbai Indians will take on Chennai Super Kings at Mumbai's Wankhede stadium.