Wawrinka kept his nerve in two tie-breaks to set up a quarter-final with Djokovic.
The eighth seed, who lost to Djokovic in a five-set fourth-round duel last year, won 90% of his first serve points against Robredo.
"The serve was really good," he said. "I feel really good and I haven't had too many matches before today.
"I had one walkover and my first opponent pulled out after the first set, so it was good to have a tough match."
The eighth seed, who lost to Djokovic in a five-set fourth-round duel last year, won 90% of his first serve points against Robredo.
"The serve was really good," he said. "I feel really good and I haven't had too many matches before today.
"I had one walkover and my first opponent pulled out after the first set, so it was good to have a tough match."
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