Washington-Sana
Americans Daniel Collins and Jessica Pegula qualified for the quarter-finals of the San Diego Women's Tennis Championships.
Collins, ranked 19th in the world, qualified after defeating her Italian opponent, Martina Trevisan, in two sets without a response, 6-2, 6-4.
World number six Pegula qualified after she overcame compatriot Coco Vandeweghe by two straight sets, 6-3, 6-1.
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Collins