Mumbai Indians stayed on course for a play-off berth after pulling off a narrow five-run win over defending champions Kolkata Knight Riders in a nerve-wracking last-over IPL thriller.The hosts first recovered from a poor start of 79 for four to post 171-4 following a whirlwind knock of 61 not out in 31 balls from Hardik Pandya.Chasing the score, Knight Riders lost wickets at regular intervals after a bright start of 45 but still were in the hunt for a win and a place in the play-off when they needed 12 runs in the last over bowled by Kieron Pollard.However, the big-built West Indian conceded only six runs after taking the wicket of danger man Yusuf Pathan who was caught behind for 52 off the first ball to help Mumbai cross the finish line at the Wankhede Stadium.Kolkata Knight Riders player Gautam Gambhir cline bowld by Mumbai Indiands Jagdisha suchith during IPL 8 Match at Wankhede Stadium,in Mumbai