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Learner Tien of the U.S. is congratulated after winning his second round match against Daniil Medvedev of Russia, right, at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. is congratulated after winning his second round match against Daniil Medvedev of Russia, right, at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia throws his racker during his second round match against Learner Tien of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia throws his racker during his second round match against Learner Tien of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. speaks after winning his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. speaks after winning his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. gestures during his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. gestures during his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. plays a forehand return to Daniil Medvedev of Russia during their second round match against at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. plays a forehand return to Daniil Medvedev of Russia during their second round match against at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia plays a backhand return to Learner Tien of the U.S. during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia plays a backhand return to Learner Tien of the U.S. during their second round match at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia reacts during his second round match against Learner Tien of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia reacts during his second round match against Learner Tien of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. eats pizza as he leaves from a press conference for his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. eats pizza as he leaves from a press conference for his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. gestures during his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. gestures during his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia gestures during his second round match against Learner Tien of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia gestures during his second round match against Learner Tien of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. celebrates after winning his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. celebrates after winning his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia reacts during his second round match against Learner Tien of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Daniil Medvedev of Russia reacts during his second round match against Learner Tien of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 16, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. celebrates after winning his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)

Learner Tien of the U.S. celebrates after winning his second round match against Daniil Medvedev of Russia at the Australian Open tennis championship in Melbourne, Australia, in the early hours of Friday, Jan. 17, 2025. (AP Photo/Ng Han Guan)