Philippoussis will now face Sjeng Schalken of the Netherlands, who beat 14th-seeded Spaniard Albert Costa.
"I was extremely happy the way I played today, " Philippoussis said after a 6-2 6-3 win.
Philippoussis finally cracked when he double-faulted at 5-5 in the third set tie-break to hand Ferreira match point.
Another veteran, South African Wayne Ferreira , booked his quarter-final spot with victory over big-serving Australian Mark Philippoussis .
"I didn't feel like I was on the ball very well, " said Philippoussis.
Ferreira took the first-set tie-break 7-5 before Philippoussis took the second set 6-4 to send the match into a decider.
Australian Mark Philippoussis was also upbeat after beating Spaniard Alex Corretja 5-7 6-4 7-6 on his return from a fourth knee operation.
Philippoussis said his rhythm was off as he blasted 13 aces against Ferreira compared to 22 a day earlier against Gustavo Kuerten.
Australia, meanwhile, have been boosted by the news that Mark Philippoussis could be fit to play alongside world number one Lleyton Hewitt.
Seventh seed Ferreira, 31, showed the form which helped him beat second seed Sebastien Grosjean and fifth seed Mark Philippoussis in earlier rounds.
Ferreira moved well on the court on Saturday despite playing with a nagging groin injury, and frustrated Philippoussis with his suberb service returns.
"My knee is not sore or anything, which is great because as a three-set match goes it's not going to get any tighter than that, " Philippoussis said.
It quickly became clear that he must be a former tennis pro, and I waded over to my wife to tell her that we were staying in the same hotel as Mark Philippoussis.
If life is a beach for Philippoussis now, it wasn't towards the end of his career when injury blighted his final attempts to snare the one thing his resume lacked -- a major title.
CNN: Surf and volley: Life's a beach as 'The Scud' finds peace
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