Daniil Medvedev shrugged off an injury scare to beat Andrey Rublev in straight sets and book his place in the US Open semi-finals.
The 2019 runner-up required treatment for a shoulder injury and cramp midway through the third set but managed to wrap up a 7-6 (8-6) 6-3 7-6 (7-5) victory.
The pair were the first Russian duo to reach the quarter-finals at a Grand Slam since Igor Andreev and Nikolay Davydenko at Roland Garros in 2007.
Medvedev, who was runner-up to Rafael Nadal last year, saved four set points in the first set tie-break. He hit 50 winners in comparison to Rublev's 22 and the straight-sets victory means that he's yet to drop a set in this year's tournament.
No player in the Open Era has won the US Open men's title without dropping a set. Medvedev will meet either the second seed Dominic Thiem or Alex de Minaur in the semi-finals.
"It was tough at the end, that was why for the first time in almost a year I actually celebrated my win," he said on court after.
"I felt like I could get in trouble so I was really happy to get the win after that tough tie-break. One point decided two sets, so it was a really tough yet.
"Andrey played unbelievably. He played really well, so I'm very happy with my win."
The first set between two lifelong friends swung with serve before Rublev let slip a golden opportunity to become the first man to take a set off Medvedev in the tournament, letting slip a 5-1 lead in the tie-break. วิเคราะห์บอล
He let his frustration get the better of him as he rammed his racket into the court, and also received a code violation for an audible obscenity after Medvedev broke for the first time in the match to go 4-2 up in the second set.
Medvedev looked fully in command until midway through the third set when his movement became restricted, and he called for medical time-out at 4-5 down in the set.
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