Kei Nishikori has suffered a surprise first-round defeat at the French Open against world number 59 Martin Klizan.
The Japanese ninth seed lost a tight opening set 7-4 in a tie-break, but it was thoroughly one sided in the second as Klizan came through 6-1 in just 28 minutes.
Nishikori, who is coached by former French Open champion Michael Chang, failed to recover in the third before his Slovakian opponent sealed the straight-sets victory 6-2.
Klizan will now take on Dutchman Robin Haase for a place in round three in Paris.
