Roberto Bautista Agut has pulled off an upset…

The 29-year-old Spanish tennis player, seeded No. 18, beat ninth-seeded Kei Nishikori of Japan in the third round 6-4, 7-6 (3), 3-6, 6-3.

This was their fifth match against each other on tour — and the first won by Bautista Agut.

“I couldn’t maintain my level high enough,” Nishikori said. “I think he served well every set. Was really tough time (on) my return game.”

Bautista Agut reached the fourth round at the All England Club for the second time, having reached it in 2015. He reached the third round last year. But he has never reached the quarterfinals at any Grand Slam tournament, losing all eight previous times he got to the round of 16 at majors — the most losses without a win by any man during the Open Era, according to ESPN Stats & Information.

Bautista Agut’s next opponent is No. 7 seed Marin Cilic, the 2014 US Open champion who advanced by beating No. 26 seed Steve Johnson of the United States, 6-4, 7-6 (3), 6-4.