The U.S. Open women's quarterfinals begin Tuesday with No. 8 Serena Williams facing No. 18 Wang Qiang and No. 5 Elina Svitolina playing No. 16 Johanna Konta. 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.

Now, Mair has broken down the quarterfinals like only he can and released his best bets on Tuesday's matches. He is confident he has both Tuesday winners, and he's recommending one prop bet that pays almost 5-1! You ABSOLUTELY need to see Mair's picks and analysis before locking in your U.S. Open quarterfinal picks.

Who wins Williams-Qiang and Svitolina-Konta? And which best bet should you make for a nearly 5-1 payout? ... Join SportsLine right now to see Gavin Mair's five best bets for Tuesday's women's quarterfinals, all from the acclaimed expert who called Naomi Osaka winning last year's U.S. Open at 32-1! -- Use promo code TENNIS to get your first month of SportsLine for a buck!