Winners of a combined 38 Grand Slam singles titles, Roger Federer and Rafael Nadal meet in a must-see Wimbledon semifinal on Friday. The match begins around 10 a.m. ET from Centre Court at the All England Club. Federer, 37, has won 20 Grand Slam crowns and is looking to add to his record haul of eight Wimbledon titles. Grass is his favorite surface, and he’s won more matches at Wimbledon, 100, than any player in any Grand Slam tournament. Nadal, though, has looked dominant at Wimbledon, dropping only one set. In his last three matches, he has blasted 109 winners against just 34 unforced errors. He also holds a 25-14 all-time edge versus the Swiss maestro. Bookmakers list Nadal as a -130 favorite (risk $130 to win $100) in the latest Federer vs. Nadal odds, with Federer getting +110 (risk $100 to win $110) as the underdog. On the game spread, Nadal is favored by 1.5. You can also bet Nadal to win in straight sets at +350 and Federer to win in straight sets at +500, among many wagering options. Before you make any Federer vs. Nadal picks and 2019 Wimbledon predictions for the men’s semifinals, see what British grass-court tennis expert Sean Calvert has to say.

An uncanny handicapper who’s been cashing consistently for six-plus years, Calvert took down a huge score in March on Dominic Thiem winning Indian Wells at 80-1 and he followed that up last month by calling Adrian Mannarino’s Libema Open title at 25-1. The Libema Open is a grass-court event like Wimbledon, a surface Calvert knows better than anyone. Not only did he call Andy Murray’s 2013 and 2016 Wimbledon championships, but anyone who has followed his grass-court picks is up nearly $4,400.

In Wednesday’s quarterfinals, Calvert told readers to bet Federer at +230 (risk $100 to win $230) to defeat Kei Nishikori three sets to one — and that’s exactly what happened.

Now, Calvert has dialed in on Federer vs. Nadal and locked in multiple best bets. Not only is he picking the winner, he’s also betting on how many sets the match lasts, how many games the first set goes, and whether there will be a tiebreak. He’s sharing it all only at SportsLine.

Calvert knows Nadal, a two-time Wimbledon champ, is in rare form. This is only the second time he’s made the Wimbledon semifinals having dropped just one set. And the first time it happened, in 2008, he won the title after beating Federer in a five-set marathon. Nadal’s return game has never been better too. Over his last three matches, he’s created 35 break points and converted 16 of them.

But just because Nadal, 33, is four years younger than Federer and in better current form doesn’t mean he’ll get the best of the Swiss maestro.

Federer typically elevates his game at this stage of Wimbledon; he’s 11-1 in the semifinals. All-time at Wimbledon, Federer is a stunning 100-12, and at this tournament, he’s been broken just three times. After dropping the first set to Nishikori on Wednesday, Federer stormed back to win three straight, finishing with 54 winners and 11 aces.

Not only is Calvert releasing his winner and three confident prop picks, he’s also including his best bets for the first semifinal featuring Novak Djokovic vs. Roberto Bautista Agut. You can only see his in-depth picks and analysis at SportsLine.

So who wins Federer vs. Nadal? And what are the best bets you can make on this must-see showdown? Visit SportsLine now to see Sean Calvert’s strong 2019 Wimbledon picks for the semis, all from the British tennis expert who’s up nearly $4,400 on grass-court events.