After splitting the first two sets, the third-seeded Swiss trailed 6-4 in the third-set tiebreaker but battled back to win 9-7 and closed out the victory over the Spanish 16th seed in the fourth set.
"It was a really tough battle today. It's always tough to play against him, he is always fighting," said Wawrinka, who showed his competitive fire with a dive into the stands during a point in the tight confines of Louis Armstrong Stadium.
Wawrinka will play either big-serving Canadian Milos Raonic, the fifth seed, or 10th-seeded Kei Nishikori of Japan in the quarter-finals.
(Reporting by Larry Fine; Editing by Peter Rutherford)
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