Mmoh moves on in Miami Open

3/22/2018 1:37:23 AM EST

In a rough afternoon for American men on Wednesday at the Miami Open, the only winner defeated another U.S. player.

Qualifier Michael Mmoh edged wild-card entrant Christopher Eubanks 4-6, 6-4, 6-4 in first-round action.

Portugal's Joao Sousa upset American Ryan Harrison 7-6 (4), 7-6 (4), France's Pierre-Hugues Herbert defeated American Taylor Fritz 7-6 (4), 6-4, and Great Britain's Liam Broady topped Bjorn Fratangelo 7-6 (5), 6-3 in a battle of qualifiers.

The U.S. day took an upward turn Wednesday night, though, when Jared Donaldson got past Cyprus' Marcos Baghdatis 6-3, 6-4.

Mmoh, a 20-year-old ranked 176th in the world, was born in Saudi Arabia and resides in Bradenton, Fla. He earned the first two ATP World Tour main-draw victories of his career in January at Brisbane, Australia, where he reached the quarterfinals.

With the Wednesday win, he improved his all-time ATP record to 3-8.

Eubanks, a 21-year-old from Atlanta, fell to 2-6 in his ATP career with the defeat. Ranked 284th in the world, he was competing in his first main-draw event on the top-level tour this year.

Eubanks and Mmoh also squared off last month in a Challenger (second-tier) event in San Francisco, with Mmoh earning a 6-4, 6-4 win.

Mmoh moves on to a second-round matchup with 12th-seeded Roberto Bautista Agut of Spain.

Elsewhere in opening-round play Wednesday, Canada's Vasek Pospisil slipped past Croatia's Ivo Karlovic 7-6 (4), 7-6 (5). Karlovic had 15 aces and eight double faults, while Pospisil served five aces and double-faulted five times. Each player broke serve just once in the match.

Other winners included Austalia's Matthew Ebden and John Millman, Chile's Nicolas Jarry, Germany's Maximilian Marterer, France's Jeremy Chardy and Benoit Paire, Sweden's Mikael Ymer, Russia's Mikhail Youzhny, the Czech Republic's Jiri Vesely and the Netherlands' Robin Haase.

The tournament's 32 seeded players -- including No. 1 Roger Federer of Switzerland, No. 2 Marin Cilic of Croatia, No. 3 Grigor Dimitrov of Bulgaria, No. 4 Alexander Zverev of Germany and No. 5 Juan Martin del Potro -- all received first-round byes. Del Potro defeated Federer in the final of the BNP Paribas Open at Indian Wells, Calif., on Sunday.

--Field Level Media