In the men's event, second seed Agassi will face Frenchman Sebastien Grosjean in the quarter-finals, after fourth round opponent Guillermo Coria retired injured as Agassi led 6-1, 3-1.
Agassi was happy to have been given a light examination as the second week looms. "It came as a bit of a surprise, but there's some good in it. I've had enough tennis to be ready. I'll certainly be rested and ready to go," Agassi said.
Grosjean, the 12th seed, defeated Spaniard Felix Mantilla 3-6, 2-6, 6-3, 6-3, 6-3, battling from two sets down to advance.
Spanish fourth seed Juan Carlos Ferrero meanwhile had too much class for young Croatian Mario Ancic.
Ferrero advanced to his first Grand Slam quarter-final outside his preferred French Open with a 6-0, 6-3, 6-2 win in 1hr 41min.
The Spaniard will play South African Wayne Ferreira in the last eight tomorrow.
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