ACAPULCO, Mexico — Second-seeded Holger Rune eased past American Michael Mmoh 6-2, 6-3 on Tuesday and advanced to the second round of the Mexican Open.
Rune, ranked seventh in the ATP, needed 92 minutes to dispatch Mmoh, who made his way into the main draw through the qualification tournament.
The 20-year-old Rune, from Denmark, reached the semifinals in Acapulco last year. He advanced to face the winner of the late match between Aleksandar Kovacevic and Jordan Thompson.
Earlier, fifth-seeded Stefanos Tsitsipas defeated Roman Safiullin 6-3, 6-4 and moved on to the second round where he will face Flavio Cobolli.
The 25-year-old Greek reached the semifinals last week in Los Cabos, Mexico, and is trying to win his first career 500 tournament.
Also Tuesday, Frances Tiafoe, seeded eighth, rallied to beat Max Purcell 4-6, 6-3, 6-0. He moved on to face Dominik Koepfer, who took care of Terence Atmane 6-4, 4-6, 6-0.
Tiafoe is the highest-ranked American player in contention in the tournament after fourth-seeded Taylor Fritz and seventh-seeded Tommy Paul were knocked out on Monday.