Wild card KO's ex-French champ Wawrinka

Wawrinka, at 14 years older than his 23-year-old opponent, had previously played only four tour-level matches this season, winning two. He missed most of last season after having surgery on his left foot.

Moutet, world No.139, had lost six of his last nine matches.

Elsewhere British No.2 Dan Evans finally won a match at Roland Garros at the fifth time of asking.

A first-round loser in each of his four previous main draw appearances Evans beat Argentina's Francisco Cerundolo 7-6 (7-3) 6-4 6-4.

American 18th-seed Reilly Opelka lost to Filip Krajnovic in straight sets.

With agencies