Paris:Japanese tennis star Kei Nishikori fought back in a marathon four-hour match to beat Russian 23rd seed Karen Khachanov 4-6, 6-2, 2-6, 6-4, 6-4 and secure a place in the French Open third round.
Three days after another five-set comeback over Italian Alessandro Giannessi, world No.49 Nishikori -- ranked fourth in the world during his peak -- refused to give up and set up a clash with Switzerland's Henri Laaksonen.
Laaksonen, the world No. 150, held his nerve to defeat 11th seed, Spain's Roberto Bautista Agut, 6-3, 2-6, 6-3, 6-2 in two hours, 21 minutes.
Laaksonen, 29, struck 53 winners, including nine aces, in his first top 20 win of his career.
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World No.5 Stefanos Tsitsipas of Greece breezed into the third round following a 6-3, 6-4, 6-3 win over Spaniard Pedro Martinez. He will take on American world No. 34 John Isner in the third round after the latter eased past Serbia's Filip Krajinovic 7-6(6), 6-1, 7-6(5).
Sixth seed Alexander Zverev of Germany used all his energy to overcome Russian qualifier Roman Safiullin 7-6(4), 6-3, 7-6(1) to secure a spot in the third round.