Korda, 1998 Australian Open Champ Petr’s Son, in 1st Slam QF

Sebastian Korda of the United States plays a forehand during the fourth round singles match against Hubert Hurkacz of Poland during day seven of the 2023 Australian Open at Melbourne Park in Melbourne, Australia, on Jan. 22, 2023 . Clive Brunskill/Getty Images

MELBOURNE, Australia—This was not a smooth ride for Sebastian Korda at the Australian Open on Sunday, Jan. 22. An early deficit against a higher-seeded opponent. Some so-so serving. An up-and-down fifth-set tiebreaker filled with mistakes by both players.

At the end—the very end—it was Korda, a 22-year-old American, who earned a spot in his first Grand Slam quarterfinal by taking the last trio of points to edge No. 10 Hubert Hurkacz 3–6, 6–3, 6–2, 1–6, 7–6 (10–7).