- Lois Bosson would have turned $100 into $50,000 for bettors throughout the five matches.
PARIS – Lois Boisson has shocked the tennis world and legal tennis betting sites with a historic, odds-defying run to the 2025 French Open semifinals. Entering the tournament as a wildcard ranked No. 361 in the world, Boisson was virtually unknown after an ACL last year.
But after a series of remarkable upsets, including a straight-sets win over No. 6 seed Mirra Andreeva on Wednesday morning, she’s now just two wins away from becoming the lowest-ranked Grand Slam finalist in modern history.
6 GAMES IN A ROW TO REACH THE SEMI-FINALS FOR LOIS BOISSON 🔥#RolandGarros pic.twitter.com/MLPBookvlt
— Roland-Garros (@rolandgarros) June 4, 2025
In her quarterfinal match, Boisson closed as a +575 underdog to Andreeva, who was a -1000 favorite. Boisson not only covered the +5.5 game spread but won outright, delivering massive payouts for longshot bettors and those backing her moneyline.
Earlier, she stunned No. 3 seed Jessica Pegula as a +460 underdog, winning in three sets. With each victory, Boisson has rewritten the French Open betting expectations and grown her legendary story on home soil.
Boisson Roll-Over Bet Tracker: $100 to $50,000
If you’d rolled over your winnings from Boisson’s opening match (reinvesting the full amount each time), here’s how much you’d be holding going into the semifinals:
| Round | Opponent | Odds | Bet | Return |
|---|---|---|---|---|
| R1 | Mertens | +380 | $100.00 | $480.00 |
| R2 | Kalinina | -130 | $480.00 | $849.60 |
| R3 | Jacquemot | -175 | $849.60 | $1,334.58 |
| R4 | Pegula | +460 | $1,334.58 | $7,475.65 |
| QF | Andreeva | +575 | $7,475.65 | $50,443.48 |
- Total Profit: On an initial $100, you’d have a return on investment of 50,343%!
Boisson has been a Cinderella story for fans and a dream scenario for longshot bettors and anyone who saw the signs early is now likely limited at legal sports betting sites with their massive returns.
What’s Next for Bettors?
While semifinal odds haven’t been released at time of writing, Boisson is almost certain to be a big underdog once again. Likely priced between +350 and +500 against Coco Gauff in the semifinals, her on-court composure, powerful forehand, and roaring home crowd give her more live value than the number alone suggests.
But Gauff will be her toughest test yet. Reaching the finals of both the Madrid Open and the Italian Open, her consistency and adaptability on the surface have continued at the French Open. Gauff advanced to her third Roland Garros semifinal without dropping a set until the quarterfinals
