Kolkata Knight Riders thrashed Rajasthan Royals by 86 runs to close in on a place in the Indian Premier League play-offs.

Shubman Gill's 56 helped Kolkata to a commanding total of 171-4 in Sharjah, where the Royals succumbed to a chastening defeat.

Shivam Mavi took four wickets, with Lockie Ferguson claiming three scalps as the Royals capitulated to 85 all out in the 17th over.

Kolkata look certain to finish in the top four, while their beaten opponents' already slim hopes went up in smoke.

Gill and Venkatesh Iyer (38) laid a solid foundation for KKR with a 79-run opening partnership, with the remainder of the order contributing double-figure scores.

By contrast, only two Royals batsmen hit double figures as Rahul Tewatia's fine 44 went unrewarded.

Mavi magic

With the Royals losing Yashasvi Jaiswal in the first over and slumping to 13-4 after only 22 deliveries, the writing was on the wall early on in their reply.

Mavi did much of the damage with the ball, his 4-21 restricting the Royals to their lowest total in this IPL season.

KKR almost there

The only team who can prevent the Knight Riders extending their campaign are reigning champions Mumbai Indians.

But the Indians, who play Sunrisers Hyderabad on Friday, must bat first and win by a record 171 runs in order to claim fourth spot on net run rate.