Dominic Thiem believes Emma Raducanu's sensational US Open triumph might be the "greatest breakthrough performance of all time".
Raducanu, 18, overcame fellow teenager Leylah Fernandez 6-4 6-3 on Saturday to cement her place in history.
Her triumph meant she became the first qualifier – male or female – in tennis history to win a grand slam final.
She did not lose a set in 10 matches across qualifying and the main draw, becoming the first player since Serena Williams in 2014 to win the US Open without dropping a single set.
Raducanu – whose first grand slam appearance only came at Wimbledon in June – was ranked 150th in the world before the US Open, but her stunning win in New York has seen her break into the top 30.
Thiem, who missed the men's tournament with a wrist injury, was in awe of Raducanu's stunning run at Flushing Meadows and says he can scarcely recall a more impressive breakthrough in the sport.
"There were some other great achievements in the past but with Emma Raducanu, starting in the qualifiers and then playing such great tennis and making this incredible path, it's definitely, maybe, the greatest breakthrough performance of all time," he exclusively told Stats Perform.
"It's an incredible journey if you look at the stats. She didn't lose one set the whole tournament. She came from qualifying and she didn't even play one tie-break. That's simply amazing and something that was probably never witnessed before.
"And also the way she plays, her technique, the way she moves, somehow she brought it up to a new level for the whole game and it was great to see.
"But as well, her opponent, it was so fun to watch her. I was excited for it, watching every single point on TV. And it was great not only for women's tennis, but for all sports in general."
Medvedev pushed all the way to avoid third-round scare in Italian Open
Daniil Medvedev had to dig deep to overcome Hamad Medjedovic at the Italian Open on Monday and stay in with a chance of retaining his title.
Medvedev came out on top with a 7-6 (7-5), 2-6, 7-5 victory, but was made to work hard to avoid a third-round upset.
After enduring an up-and-down opening two sets in which he hit 10 double faults, Medvedev rallied into a lead before holding off Medjedovic’s fight-back.
The second seed remained composed to break in the match’s final game to advance after two hours and 50 minutes.
Medvedev will now play Tommy Paul in the next round on Tuesday, with the American seeing off Dominik Koepfer 6-4, 6-3.
Data Debrief: Reigning champion fights on
Medvedev has reached the last 16 at all 5 Masters 1000 events this season, with only Alexander Zverev able to match that distinction.
It was not an easy ride for him though, as Medjedovic wanted to prove a point against his first Top 10 opponent in what was his first Masters 1000 third round.
Swiatek passes Kerber test to reach Italian Open quarter-finals
Two-time Italian Open champion Iga Swiatek advanced to the quarter-finals of this year's tournament with an impressive 7-5 6-3 win over Angelique Kerber on Monday.
Three-time grand slam winner Kerber provided Swiatek with a real step up after routine victories over Bernarda Pera and Yulia Putintseva in the first two rounds on the clay in Rome.
Kerber responded to Swiatek's first break – which came in the eighth game – with one of her own, but the world number one then recaptured her composure to force a series of break points in Kerber's next two service games, finally converting at the eighth attempt to take the opener.
Kerber refused to go away, breaking straight back in the first game of the second set, but Swiatek upped her game to take the contest away from the 36-year-old.
Swiatek dropped just three further points on her own serve from there, adding three breaks of her own to set up a last-eight meeting with Madison Keys for Tuesday.
Data Debrief: Swiatek unmatched on clay
While Kerber rolled back the years to trouble Swiatek early on, she lacked the staying power to live with the world number one in longer rallies on a surface where she is truly unmatched.
Her win ratio at clay-court events at WTA 1000-level now stands at 88.2 per cent (30 wins, four defeats), the best of any player to have played a minimum of five matches since the format's 2009 introduction, ahead of Serena Williams at 88 per cent.
Osaka sees encouraging Italian Open run halted by Zheng in last 16
Naomi Osaka's promising Italian Open run was halted by Zheng Qinwen on Monday, as the seventh seed denied the four-time grand slam champion a quarter-final place.
Following Saturday's triumph over Daria Kasatkina – her second successive straight-sets win over a top-20 opponent in Rome – Osaka laughed off the "Clayomi" moniker given to her by some fans.
On Monday, her old troubles on the surface came back to the fore as Zheng dominated from the off to make the tournament's last eight for a second straight year, winning 6-2 6-4.
Osaka saw her serve broken in the very first game only to hit straight back, but Zheng assumed control by taking seven straight games to go from 2-1 down in the opener to 2-0 up in the second set.
The 21-year-old produced a clinical performance and converted all four of her break points, winning 78 per cent of first-serve points to Osaka's 68 per cent as she teed up a quarter-final clash with either Coco Gauff or Paula Badosa.
Data Debrief: 'Clayomi' no more as Zheng triumphs
Osaka impressed on a surface long regarded as her worst in Italy, but it was a bridge too far for her on Monday, Zheng reaching her fourth WTA 1000 quarter-final.
Since the format's introduction in 2009, she is just the second Asian player to reach multiple quarter-finals on both hardcourts and clay at that level before the age of 23, the other being Osaka.
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