The must-see U.S. Open women's semifinals are set for Thursday night with No. 5 Elina Svitolina facing No. 8 Serena Williams, and No. 13 Belinda Bencic playing No. 15 Bianca Andreescu. Before you make any picks, you need to see who Gavin Mair is backing.

Not only did the famed international tennis expert call Naomi Osaka winning last year's U.S. Open at 32-1, but $100 bettors who have tailed his U.S. Open picks the past two years are up $4,450. And amazingly, Mair called all four women's quarterfinal winners! Anyone who has followed him is WAY UP.

Now, Mair has broken down the semifinals like only he can and released four best bets, including a play on exactly how long Williams' match lasts. You ABSOLUTELY need to see Mair's picks and analysis before locking in your U.S. Open semifinal picks.

Who wins Williams-Svitolina and Bencic-Andreescu in the U.S. Open semifinals? And what are the best bets you should make? ... Join SportsLine right now to see Gavin Mair's U.S. Open semifinal picks, all from the acclaimed expert who called all four quarterfinals correctly! -- Use promo code TENNIS to get your first month of SportsLine for a buck!