Italy's Jannik Sinner stuns top-ranked Carlos Alcaraz of Spain in Miami Open semis

Tenth-seeded Jannik Sinner of Italy stunned top-ranked Carlos Alcaraz on Friday night in the Miami Open semifinals, rallying from a set down to beat the defending champion, 6-7 (5), 6-4, 6-2 in a three-hour thriller.

Sinner, the 21-year-old who made the Miami Open final last year but hasn't been past the quarterfinals of a major, will face fourth-seeded Daniil Medvedev of Russia in the championship match Sunday. Medvedev has beaten Sinner in all five meetings.

Alcaraz had been so dominant recently, he hadn't lost a set since February before Sinner's rally in the Miami humidity. The Alcaraz hype train has been so breakaway NBA stars Luka Doncic and Jimmy Butler showed up to watch the Spanish star from the teal seats.

Alcaraz also fought Sinner in Indian Wells in the semifinals, and it was a taut match but not quite like this. These two young guns are poised for a long and spectacular rivalry. Sinner's victory ended Alcaraz's hope of becoming the first man since Roger Federer in 2017 to win the Sunshine Double of Indian Wells and Miami.

Medvedev beat fellow Russian Karen Khachanov 7-6 (5), 3-6, 6-3 on the same day Wimbledon announced Russians will be allowed back.

Medvedev has won 23 of 24 matches — the lone loss to Alcaraz — and is in his fifth straight final.

Alcaraz prevailed in the first set in a tiebreaker but that took a lot out of Alcaraz's 19-year-old legs. Between points in the third set, Alcaraz was stretching noticeably during the third set, trying to stave off cramps and waved to the crowd for support.

Despite Alcaraz getting the second set back on serve, Sinner stunned Alcaraz in the ninth game, breaking him at love to go up 5-4 and then closing it out. Alcaraz had won 21 straight sets.

An ATP trainer came out to attend to Alcaraz midway through the second set, examining one of his fingers before the cramps set in.

Kvitova to face Rybakina in women's final

Also Friday, No. 15 seed Petra Kvitova beat unseeded Sorana Cirstea 7-5, 6-3 in the second women's semifinal. Kvitova will face Elena Rybakina in the final.

The lefty from the Czech Republic rallied from a 5-3 hole in the first set, facing two set points at 15-40 before willing herself back against the Romanian.

Kvitova won six straight games in all, taking the first set and going up a break and 2-0 in the second.

Kazakhstan's Rybakina, who has won 13 straight matches, including the Indian Wells title last week, beat American Jessica Pegula in straight sets in a rain-delayed match that ended late Thursday night.

Fernandez, Townsend reach women's doubles final

Leylah Fernandez of Montreal will be playing in the women's doubles final.

Fernandez and her partner Taylor Townsend of Chicago edged past Magda Linette of Poland and American Bernarda Pera in a 70-minute Friday night semifinal thriller, losing the first set 6-1, then bouncing back with 6-2 and 14-12 victories.

Townsend and Fernandez only had one ace in the tight match, but did a great job controlling unforced errors and saving break points (4-of-6).

Townsend and Fernandez will play Americans Coco Gauff and Jessica Pegula, who defeated American Nicole Melichar-Martinez and Ellen Perez of Australia 7-6(5), 7-6(4) in Sunday morning's championship final.