Serena Williams: Tiger Woods is 'one of the main reasons I'm still playing'

Serena Williams kept her remarkable career alive for a bit longer after stunning No. 2 Anett Kontaveit on Wednesday to advance to the third round of the U.S. Open. 

Williams has all but confirmed she'll be walking away from tennis after the U.S. Open. However, her storied career may have ended much sooner if not for another transcendent superstar. 

Tiger Woods cheered Williams on from the stands Wednesday. After the match, Williams spoke about Tiger's impact on her career.  

"He's one of the reasons I'm here, one of the main reasons I'm still playing," Williams said. "We talked a lot. He was really trying to get me motivated."

Williams and Woods walked off the court together after her second-round upset. Woods tweeted later, "It was a privilege to watch greatness."