NEW YORK -- Casper Ruud headed into the 2022 season with just one Grand Slam appearance that lasted as far as the fourth round anywhere and was determined to improve his record at the four most important events in tennis.
Then, a day before the Australian Open began in January, he twisted his ankle in practice and needed to withdraw. Hardly ideal. Just look at him now: Ruud is into the semifinals at the US Open and has a shot at moving up to No. 1 in the ATP rankings, following a run to the final at the French Open.
The 23-year-old from Norway, who is coached by his father, former professional player Christian, parlayed what he called "a better start than I ever had before in a match'' to a 6-1, 6-4, 7-6 (4) victory over 2021 Wimbledon runner-up Matteo Berrettini in the quarterfinals under a closed roof at Arthur Ashe Stadium on a rainy Monday.
He is the first Scandinavian man to reach multiple major semifinals in the same year since Sweden's Magnus Norman in 2000, and the first Norwegian player to make a US Open semifinal.
"During Paris, something clicked, and I feel like I, this year, have sort of figured out the better way how to play five sets and knowing that it's very different from playing best-of-three sets. ... Sometimes realizing, or knowing, that you can sort of let one set go every once in a while to save some energy for the rest of the sets,'' the No. 5-seeded Ruud said. "So I think I matured and learned how to play five sets better than I did last year.''
He improved to 12-2 in Grand Slam competition in 2022 after making just two unforced errors in the first set, 11 fewer than No. 13 Berrettini.
"Everything sort of went [in] my favor,'' Ruud said. "I was hitting all the spots, all the shots that I needed to.''
Berrettini's take: "After 20 minutes I was [down] 5-0. I don't know how really. I don't know what happened.''
Ruud beat Berrettini on clay in July's Gstaad final and looked just as effective on the hard court, hanging back behind the baseline to absorb the Italian competitor's powerful groundstrokes.
Sprinting through a sublime first set in which he produced just two unforced errors, it looked like Ruud was on track for a blowout victory when he was up 5-1 in the second set. But Berrettini, who was sidelined a number of times this season because of injury or illness, slowly began to find his usual level and appeared to have cracked the code in the third set when he broke Ruud in the second game and saved four break points in the third.
But Ruud mustered a comeback, breaking Berrettini in the ninth game, and then never trailed in the tiebreak.
Ruud now will face No. 27 Karen Khachanov, who beat Wimbledon finalist Nick Kyrgios in five sets on Tuesday night.
Defending US Open champion Daniil Medvedev, who was ousted by Kyrgios in the fourth round, will drop from No. 1 in the men's rankings on Monday, and three players have a shot at replacing him: Ruud, Rafael Nadal (who lost in the fourth round to Frances Tiafoe on Monday) and No. 3 Carlos Alcaraz (who plays Jannik Sinner in the quarterfinals Wednesday).
"It's still far away, I think, but of course it's nice that it's possible. And Casper has a little bit of motivation with that in mind,'' Christian Ruud said, "because even when he was small, his ultimate goal was to be No. 1 in the world.''
ESPN Stats & Information, The Associated Press and Reuters contributed to this report.