Teenager Moïse Kouamé won a first round battle of the generations 7-6 (7-4), 6-2, 6-1 against Marin Cilic on Tuesday and made Frenbch Open history by doing so.
Kouamé turned 17 last month and became the youngest player in the Open era to beat a former grand slam champion in a men's match at Roland Garros.
It was the first ever grand slam match for the youngster who was in full command against former US Open champion Cilic, who is 20 years and five months younger, after edging the first set in 74 minutes.
Kouamé is also the first player born in 2008 or later to play and to win a grand slam men's match. He is coached by former French great Richard Gasquet and ranked 318th got into the main draw via a wildcard.
Another former US Open champion bowed out as seven seeded Daniil Medvedev's Roland Garros agony continued with a 6-2, 1-6, 6-1, 1-6, 6-4 defeat against Australia's Adam Walton.
Medvedev squandered two break points leading 3-1 in the fifth set of a rollercoaster match and suffered his second straight and seventh overall first-round exit in Paris with a double fault and an unforced error.
Women's world number one Aryna Sabalenka meanwhile had a winning start, 6-4, 6-2 over Jessica Bouzas Maneiro of Spain.
