American Brandon Nakashima moved into the quarter-finals of the Mexican Open when Dane Holger Rune, the No 4 seed, retired at the Arena GNP Seguros in Acapulco on Wednesday night.
Nakashima, ranked No 42, led 3-0 when Rune, ranked No 13, pulled out due to illness.
The American will face Belgian David Goffin next.
Ahead of his victory, Brandon Nakashima won against Frenchman Benjamin Bonzi (7-6 (6), 7-5).
The 21-year-old Dane defeated Spaniard Roberto Carballes Baena (7-6 (4), 6-3) in the previous round of the Acapulco tournament.
Acapulco ATP 500, other second-round results (Arena GNP Seguros, hard, USD 2.585.410, most recent results first):
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