Russian 11th seed Karen Khachanov reached the French Open quarter-finals for the second time on Sunday with a four sets win over Lorenzo Sonego of Italy, setting up a potential clash with Novak Djokovic.

Khachanov came through 1-6, 6-4, 7-6 (9/7), 6-1 to reach his third straight quarter-final at the Slams.

"I didn't know what to do in the first set but I said just fight my way through," said the Russian.

"I served for the third set, got broken and was 4-0 down in the tiebreak. It was just like the last match and I won that anyway."

Two-time champion and 22-time Grand Slam title winner Djokovic was facing Juan Pablo Varillas of Peru later Sunday attempting to reach his 14th successive Roland Garros quarter-final.

Victory would also give him a place in the last eight of a Slam for the 55th time.