Rafael Nadal Relaxes W/ Pregnant Wife Aboard Yacht After French Open Win

Rafael Nadal took a well-deserved break after winning his 14th French Open ... hitting the Spanish seas with his pregnant wife and friends on an insane mega-yacht!

The No. 4 ranked tennis star was spotted on the 78-foot, multimillion-dollar catamaran yacht named "Great White" just days after beating Norwegian Casper Ruud in the major tourney -- setting a new record with 14 French Open title wins.

And, the champ was celebrating like someone who just made history ... diving into the water, and hanging out on the deck with his buddies.

His wife, Maria Perello, was also livin' the vacay life ... just days after the couple -- who married in 2019 -- announced they're expecting their first child.

But, the R&R won't last long, though. Nadal -- who's dealing with pain in his left foot -- has Wimbledon to win ... and his first match is Tuesday against Francisco Cerúndolo.

"I'm going to be in Wimbledon if my body is ready to be in Wimbledon," Nadal said after winning the French Open.

"That's it. Wimbledon is not a tournament that I want to miss. I think nobody wants to miss Wimbledon. I love Wimbledon."