The 2020 U.S. Open begins on Monday, with Novak Djokovic the -125 favorite at William Hill. Djokovic is seeking his fourth U.S. Open crown and 18th Grand Slam title. Daniil Medvedev is 6-1, Stefanos Tsitsipas and Dominic Thiem are 7-1, and Milos Raonic is getting 20-1.

Before you make any picks on who wins the men's title, you NEED to see who Sean Calvert is picking.

Calvert is the famed handicapper who took down a huge score on Dominic Thiem winning Indian Wells at 80-1 last year, among many stunning calls. He's racked up seven straight profitable seasons betting tennis. 

At Wimbledon last year, Calvert told his followers to grab 3-1 odds on Djokovic facing Roger Federer in the final, adding Djokovic would win it all. The result: Djokovic and Federer cruised into the finals, with Djokovic winning the longest men's singles final in tournament history for his fifth Wimbledon crown. Anyone who followed Calvert's advice was handsomely rewarded.

And Calvert owns the U.S. Open. Since 2013, if you had placed $100 on each of Calvert's recommended bets, you'd be up a whopping $8,540.

For the 2020 U.S. Open, we can tell you Calvert wants no part of Thiem, who "will surely find the faster courts a big negative." Instead, Calvert is backing two other players to win, including a huge long shot whose draw sets up perfectly for a stunning run. This overlooked pro is surging at the right time and could deliver a monster payout. You ABSOLUTELY need to see who it is, along with all of Calvert's picks and analysis, before you bet.

So who wins the 2020 U.S. Open? And which MASSIVE long shot stuns the tennis world? ... Join SportsLine right now to see Sean Calvert's coveted U.S. Open picks, all from the renowned tennis expert who's up over $8,500 on his U.S. Open bets! -- Use promo code TENNIS to get your first month of SportsLine for a buck!