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 for the No 2 seed's first round match, making for 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 that 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 against Marinko Matosevic.
Jordan then got cheers of his own when his image was flashed on Arthur Ashe Stadium's massive screens.
The Federer-Jordan friendship was apparently a match made in Nike heaven. The two longtime endorsers got together recently to help design a new Federer shoe inspired by a classic 1988 Air Jordan model. Federer was wearing the white and gray sneaker on the court.
The 51-year-old Jordan and the 33-year-old Federer got together for dinner the previous night, and Federer posted a selfie arm-in-arm with his Airness on his Instagram site.
While the new shoe was officially listed as a collaboration of the two greats, Jordan made it clear that Federer called the shots on the fine details.
''I don't want you to play in a shoe that doesn't feel well,'' Jordan said, noting that every little bit helps as Federer is nearing the end of his career.
Federer, who held a record 17 Grand Slam titles, was seeking his sixth US Open crown, the same number of NBA championships won by Jordan.