Serena Williams returned a serve with her left hand and went on to win the point to spur an epic comeback in her US Open quarterfinal battle

• Serena Williams shifted the momentum during her US Open quarterfinal battle with a quirky highlight-reel play.
• The 23-time major champion returned a serve with her left hand — her non-dominant hand — and went on to win the point.
• Williams clearly gained some confidence after implementing the new trick, and staged a comeback after dropping the first set to Tsvetana Pironkova with dominant performances in the second and third.
• She'll move on to face either Victoria Azarenka or Elise Mertens in the tournament semifinals on Thursday.

Serena Williams struggled at the beginning of her 2020 US Open quarterfinal match, but managed to turn things around thanks to one incredibly quirky play.

The 23-time major champion was already down a set when she returned a serve from Bulgarian veteran Tsvetana Pironkova using her left hand.

Rather than shifting her feet to hit a forehand shot from her right side, or, as is more conventional, returning the serve with a backhand swing, Williams held the racket with her non-dominant hand and managed to keep the ball in play.

Williams went on to win the point, and her lefty return seemed to shift the momentum enough at Arthur Ashe Stadium Wednesday afternoon to spur a comeback for the 38-year-old. She went on to win the second set 6-3 before taking a dominant 6-2 victory in the third set.

Widely considered the greatest tennis player in the history of the game, Williams is just one major championship victory away from tying Margaret Court's record 24 career Grand Slam singles titles.

Williams hasn't won any of the sport's four major tournaments since she took home the Australian Open title in 2017, but she'll move on to face either Victoria Azarenka or Elise Mertens in the tournament semifinals on Thursday.

• Read more:
• SERENA WILLIAMS AND ALEXIS OHANIAN: How the tennis ace and the tech guru make and spend their millions
• 52 awesome photos of Serena Williams playing tennis throughout her career
• Naomi Osaka said she cried watching messages of thanks from the parents of Trayvon Martin and Ahmaud Arbery after her latest US Open win
• Naomi Osaka wore a Breonna Taylor mask heading into her first-round US Open victory