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Tiger Woods cheers on Serena Williams at U.S. Open; 'one of the main reasons' she's playing

Greatness respects greatness.

Serena Williams is planning to "evolve" away from tennis after the U.S. Open, and everyone wants a chance to see her make one last run — including her good friend, Tiger Woods.

Woods was in attendance, sitting in Williams' player box at Arthur Ashe Stadium, for Williams' second-round victory over world No. 2 Anett Kontaveit.

The ESPN telecast frequently showed Woods in the stands, and though he wasn't knocking in a winning putt, the 15-time major champion broke out his signature fist pump.

After the match, Woods accompanied Williams, 40, into the locker room and had his arm around her.