Gauff vs Boisson Odds & Betting Lines for French Open Semis

• Cori Gauff will meet Lois Boisson in the 2025 French Open semifinals on Thursday, June 5th
• Gauff has dropped just one set in the first five rounds
• See the Gauff vs Boisson odds, lines, and picks for the semifinals

In search of her first title at Roland Garros and second-career Grand Slam victory, Coco Gauff overcame compatriot Madison Keys in a hard-fought three-setter on Wednesday, setting up a semifinal clash with 22-year-old Lois Boisson of France, the #361 player in the world who has penned a storybook run in her home country.

Gauff vs Boisson Odds & Betting Lines

The opening moneyline in the table above is from FanDuel. The spread and total are from bet365. Gauff is listed as a -500 favorite, giving the American an 83.33% implied win probability. Boisson comes back as a +375 underdog, which amounts to just a 21.05% implied win probability. Gauff and Boisson have never met before.

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The odds to advance at bet365 are significantly different. At that sportsbook, Gauff is just a -350 favorite (77.78% IP) and Boisson is +275 (26.67% IP). The opening line at ESPN Bet is in between: Gauff -475/Boisson +310.

Gauff’s Path to the Semifinals

Gauff has been downright dominant on her way to the semifinals. The #2 player in the world didn’t drop a set in her first four matches, and required only one tiebreaker. That changed in the quarters against reigning Aussie Open champion Madison Keys, who managed to take the first set (7-6⁶) before Gauff stormed back for 6-4, 6-1 victories in the second and third sets, respectively.

Last year’s runner-up, Gauff cruised past #91 Olivia Gadecki (6-2, 6-2), #172 Tereza Valentova (6-2, 6-4), #47 Marie Bouzkova (6-1, 7-6³), and #20 Ekaterina Alexandrova (6-0, 7-5) in the first four rounds of the tournament, spending just 5.5 hours on the court.

Who Is Lois Boisson?

Lois Boisson has never finished a season ranked in the top-200 in the world. She’s had plenty of success on clay over the past two seasons (23-2 in 2024, 19-5 so far in 2025) though her victories are largely in ITF and Challenger-level events against similarly-ranked players. The French Open is only her second WTA event of the season (and second since

Boisson’s efforts at Roland Garros are a true Cinderella run. The #361 player in the world received a wild-card entry to the tournament in her home country. She was matched up with #24 Elise Mertens in the first round and won in three sets as a +333 underdog (6-4, 4-6, 6-3). She followed that up with a dominant straight-sets win over #113 Anna Kalinina as a slight -125 favorite (6-1, 6-2). By that time, oddsmakers were onto her, and she went into the third round as a -225 favorite against fellow Frenchwoman Elsa Jacquemot, eventually triumphing in another wild three-setter (6-3, 0-6, 7-5).

She was back to massive-underdog status in the fourth round against world #3 Jessica Pegula. After dropping the first set 6-3, she stormed back to take the second and third by identical 6-4 scores, cashing as a +400 underdog.

Boisson was an even bigger underdog in the quarters against rising star and world #6 Meera Andreeva, coming in at +550. She saved two set points in the first – and broke the Russian who served for the first set at 5-4 – en route to a thrilling 7-6⁶, 6-3 victory. After falling behind 3-0 in the second set, Boisson won six straight games to punch her ticket to the semifinals.