Gautam Gambhir led his Kolkata Knight Riders side to a five-wicket win over Chennai Super Kings to go within a point of the Indian Premier League summit.
Chennai made 139-5 after opting to bat first, but saw their total overhauled with two balls remaining.
Suresh Raina top-scored for Chennai with 44 in 34 balls, with captain Mahendra Singh Dhoni making an unflashy 34 not out in support.
The dependable Jacques Kallis returned 2-21 in his four-over allocation, while there were also wickets for Sunil Narine and Brett Lee.
Ravichandran Ashwin did his best to get stuck into the Knight Riders, removing opener Brendon McCullum for two and returning to see off the dangerous Yusuf Pathan.
Dwayne Bravo also took two wickets but Gambhir's 63 from 52 deliveries kept Kolkata in touch throughout.
Kallis was next highest scorer with 26 but it was left to Debabrata Das to hit the winning boundary off the fourth ball of the final over.