His Airness is now a member of Club Fed

Michael Jordan was a special guest in Roger Federer's courtside box at the US Open on Tuesday night, the rare spectacle of an all-time great in one sport cheering on an all-time great from another.

"I know nothing about tennis," Jordan said in an interview with ESPN, adding he was nevertheless fascinated by how smooth Federer looked on court. "He's a good athlete. I know he played basketball a bit."

Jordan, seated in the same row with Vogue editor and longtime Federer friend Anna Wintour, clapped wildly when Federer ran down a drop shot for a winner in his 6-3, 6-4, 7-6 (4) first-round victory over Australia's Marinko Matosevic. Jordan then got cheers of his own when his image was flashed on Arthur Ashe Stadium's massive screens.