Video: Serena Williams smashes racket during Australian Open match against Sloane Stephens

It was a heated quarterfinal match between Serena Williams and Sloane Stephens, a veteran American who might be considered the best ever versus an American teenager looking to make her first Grand Slam semifinal ever.

And the pressure got intense during the third set as Serena went down 1-2 and took it out on her racket.

Williams had struggled with back problems before this, winning the first set 6-3 before dropping her first set since last year's U.S. Open 5-7. It was this moment after Stephens won her serve that Williams lost it, breaking her racket and tossing it under her own chair.

No worries, as Williams went on to win her next service game.