Canadian qualifier Rebecca Marino advanced to the quarter-finals of the Citi Open tennis tournament with a 6-3, 3-6, 6-1 win over Germany's Andrea Petkovic on Wednesday.
Marino had five aces and broke Petkovic three times on 10 chances to win the first WTA Tour matchup between the players.
Petkovic committed seven double-faults and converted just one of her nine break point opportunities in a match that took one hour 53 minutes to complete.
The 31-year-old from Vancouver will next face the winner of a match between top-seed Jessica Pegula of the United States and Daria Saville of Australia.
In men's action, sixth seed Denis Shapovalov of Richmond Hill, Ont., was scheduled to face American J.J. Wolf later Wednesday.
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