Serena Williams credited Tiger Woods on Wednesday as one of the main reasons she was still playing tennis and had the golf great on his feet during her stunning win over world No. 2 Anett Kontaveit in the second round of the U.S. Open.

Woods, like Williams considered to be the best ever in his sport, cheered her on from the stands at Flushing Meadows in what is expected to be her final tournament.

Perhaps more than any other athlete, Woods, winner of 15 golf majors, can relate to what Williams is going through as she wrestles with the idea of impending retirement while trying for one more shot at Grand Slam glory.