American No. 1 leaves Lacoste in favor of Fila.
Pair sign worldwide marketing and management agreements with IMG.
The best Davis Cup doubles points of the year have recurring cast members.
"I am beyond honored," says world No. 1.
"It's the first time that I've had someone within my team whose actually played on tour against the players that I've played against," said Swiss.
World No. 3 confirms he will play mixed doubles with good friend Martina Hingis in a Swiss Olympic dream team.
Watch what happens when Maria meets herself on court and Muhammad Ali fights himself in the ring.
