The second Grand Slam of the year begins May 30, at the 2021 French Open in Paris. One of the top storylines is whether 19-year-old Iga Swiatek can repeat as French Open champion. She bowed out in the fourth round at the Australian Open earlier this year, losing in three sets to fellow contender Simona Halep. William Hill Sportsbook lists Swiatek, Halep and Ashleigh Barty as +500 favorites in the latest 2021 French Open odds.

Before you bet, you NEED to see whom Gavin Mair picked. Mair is the international women's tennis expert who called unseeded Jelena Ostapenko (80-1) winning the 2017 French Open, Osaka (32-1) winning the 2018 U.S. Open, Bianca Andreescu (20-1) winning the 2019 U.S. Open, plus many other prescient calls.

Prior to the women's final in the last year's French Open, Mair picked Swiatek to win (-163) and win in straight sets (+140), and he was right on both counts. 

Now, Mair has broken down the latest 2021 French Open women's odds from William Hill and released his coveted best bets.

In a huge stunner, Mair is fading the fourth-biggest favorite and fourth-ranked women's player in the world, Aryna Sabalenka, because she needs to harness her power.

"Of course new names may emerge, such as Aryna Sabalenka if she can find a way to master some control over her substantial firepower, but I believe a better chance for her to breakthrough may come at Wimbledon at the end of June," Mair told SportsLine.

Mair has locked in his best bets, and they include a long shot who would bring HUGE returns. He's especially high on a monumental long shot who "is worthy of consideration!" You NEED to see his picks and analysis before you make any 2021 French Open picks of your own.

Who wins the French Open 2021? And which long shots are a MUST-BACK? ... Join SportsLine right now to see Gavin Mair's best bets for the French Open women's field, all from the acclaimed expert who hit big in the last grand slam women's final! -- Use promo code TENNIS to get your first month of SportsLine for a buck!