Richard Gasquet upset Danil Medvedev 6-2 7-6 (7-5) with three breaks of serve in 90 minutes to reach the second round at the Gonet Geneva Open.
Gasquet scored his first win over an opponent ranked in the top 2 since he beat world number 1 Roger Federer at the Monte-Carlo Rolex Masters 2005.
Medvedev had beaten Gasquet in their only previous head-to-head match at the 2021 US Open en route to his first Grand Slam title.
Medvedev was playing his first match since Miami in March after undegoing hernia surgery.
Gasquet won six consecutive games from 2-2 in the first set and built up a 6-2 2-0 lead.
Medveved dropped his serve after three double faults with three double faults. The Russian player broke back in the sixth game to draw level to 3-3 and held serve at love with an ace.
Medvedev recovered from a mini-break down in the tie-break. Gasquet earned his third mini-break to win the tie-break 7-5.
The Frenchman will face Kamil Majchrzak, who cruised past Marco Cecchinato 6-2 6-3.
Thanasi Kokkinakis earned his first win on clay in seven years with a 6-4 6-3 win over Fabio Fognini in 1 hour and 28 minutes.
Kokkinakis went up a break to take a 4-1 lead. Fognini broke back in the seventh game to draw level to 4-4. Kokkinakis broke serve at love in the tenth game to claim the first set 6-4.
Fognini made two double faults and missed three game points before dropping serve in the second game of the second set. Kokkinakis did not face any break points in his remaining four service games.
Christopher O’Connell edged past Albert Ramos Vinolas 7-6 (7-5) 6-4 to set up a second round match against Reilly Opelka.
Paulo Sousa cruised past 2021 semifinalist Pablo Andujar 6-1 6-4. Sousa will face Nikoloz Basilashvili, who was leading 6-4 before Facundo Bagnis retired from the match.
