Updated

NEW YORK (AP) โ€” Not only had 2019 runner-up Daniil Medvedev not dropped a set in this U.S. Open entering his all-Russian quarterfinal against long-time pal Andrey Rublev, but Medvedev hadnโ€™t allowed more than four games in any set.

So when Rublev grabbed a sizable lead in the opening-set tiebreaker Wednesday and three times was a single point from closing it, the moment felt momentous. Turned out it was.

The No. 3-seeded Medvedev fought off that trio of chances for No. 10 Rublev in the tiebreaker by reeling off five points in a row, and was on his way to a 7-6 (6), 6-3, 7-6 (5) victory to return to the semifinals at Flushing Meadows.

The only concern for Medvedev in the latter stages was whether his body would hold up -- he was dealing with cramps and needed his right shoulder massaged by a trainer in the third set -- but he did, indeed, hold on.

โ€œIt was tough at the end,โ€ Medvedev said. โ€œI felt like I could get in trouble.โ€

He took 51 of 57 points when his first serve went in, never faced a break point and wound up with a 51-23 edge in total winners.

In all, through five matches, Medvedev has won 65 of his 68 service games, saving 6 of 9 break points.

Itโ€™s been 60 years since a man won this Grand Slam tournament without ceding a set; Neale Fraser did so in 1960 at the event then known as the U.S. Championships.

A year after losing to Rafael Nadal in a five-set U.S. Open final that lasted nearly five hours, Medvedev heads to his second career major semifinal.

He will face either No. 2 seed Dominic Thiem or No. 21 Alex de Minaur, whose quarterfinal was scheduled for later Wednesday.

The other semifinal on Friday will be No. 5 Alexander Zverev vs. No. 20 Pablo Carreรฑo Busta, who won quarterfinals Tuesday.

None of the remaining men has won a Grand Slam title.

Medvedev vs. Rublev pivoted in that first-set tiebreaker, which Rublev led 5-1, then 6-3. But Rublev started losing points and then his cool, slamming his racket down during the change of ends at 6-all. Medvedevโ€™s five-point, set-clinching run culminated with a 128 mph ace.

In the second set, Rublev leaned over and screamed and was given a warning for an audible obscenity, although he told chair umpire James Keothavong that he didnโ€™t curse.

At the changeover, Rublev told Keothavong, โ€œYou understand, beecause of your mistake, now they give me a fine?โ€

TOWEL TIMING

Count Serena Williams among the players who have complained about the amount of time chair umpires are giving players between points.

Among the changes at this pandemic-era U.S. Open is that players are responsible for getting their own towels, instead of getting them from, and handing them to, ball people. Williams -- like Novak Djokovic, before he was disqualified, and others -- say that chews up more seconds on the serve clock.

โ€œWe need to do a little work on that, because I feel like itโ€™s not enough time. I feel like sometimes Iโ€™m really, like, sprinting to get my towel and thatโ€™s not really taken into consideration,โ€ Williams said Wednesday after her three-set victory in the quarterfinals.

โ€œAnd then, sometimes," Williams continued, "I literally am looking at the towel, and I am like, โ€˜All right, Iโ€™m just not going to get it, because I simply donโ€™t have time and Iโ€™m drenched,โ€™ especially on a humid day like today.โ€

GREAT EXPECTATIONS

Tsvetana Pironkova's first tournament in more than three years ended in a Grand Slam quarterfinal against Serena Williams. Not too shabby. Still, the 32-year-old Bulgarian does not want to set the bar too high for herself moving forward.

โ€œ'Expectations'โ€ โ€” yeah, that is a special word that I donโ€™t really like. So I guess there will be more expectations after this tournament, for sure, but whether I put them on myself or not? I think I will not," said the 32-year-old Bulgarian, who left the tour after Wimbledon in 2017 and became a mother. โ€œI will try not to, because I know for sure thatโ€™s what helped me here ... (playing) carefree. Going to try to keep it that way, I hope.โ€

She was planning a comeback in March until the coronavirus pandemic put a halt to sanctioned tennis for more than five months.

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Follow Howard Fendrich on Twitter at https://twitter.com/HowardFendrich

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