This was not a smooth ride for Sebastian Korda at the Australian Open on Sunday. 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 edging No. 10 Hubert Hurkacz 3-6, 6-3, 6-2, 1-6, 7-6 (10-7).
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