So is Mark coming back? I assume no official retirement announcement means he's going to give it a go?
MARK Philippoussis is planning another comeback to professional tennis 10 months after his fifth round of knee surgery.
Australia's former US Open and Wimbledon runner-up will contest an over-30s tournament in North Carolina in September with the hope of eventually returning to the ATP Tour.
The 31-year-old Philippoussis hasn't played at the elite level since breaking down during the Australian Open wildcard playoff in January, having missed the entire 2007 season with injury.
But he refuses to believe his career is over and will join the likes of former world No.1 Jim Courier, fellow two-time grand slam finalist Todd Martin and South African veteran Wayne Ferreira in the seniors event.
Philippoussis also took part in the Outback Champions Series last year when he lost to then 48-year-old John McEnroe in the fourth-place playoff.
Philippoussis then re-injured his knee competing in the Australian Open wildcard tournament in December, forcing him to go under the knife yet again.
Philippoussis achieved a career-high ranking of No.8 in 1999 and has won 11 career ATP singles titles.
He lost to countryman Patrick Rafter in the 1998 US Open final and to Roger Federer in the 2003 Wimbledon decider, which gave the brilliant Swiss his first grand slam trophy.