Serena & Venus Williams at the Olympics

Williams sisters Venus and Serena compete for gold at the All-England Club in London during the Olympics.

WTA Tour Finals

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 29, 2017 Denmark's Caroline Wozniacki celebrates with the trophy after winning the final against USA's Venus Williams REUTERS/Jeremy Lee

WTA Tour Finals

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 29, 2017 Denmark's Caroline Wozniacki celebrates during the final against USA's Venus Williams REUTERS/Jeremy Lee

WTA Tour Finals

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 29, 2017 Denmark's Caroline Wozniacki celebrates during the final against USA's Venus Williams REUTERS/Jeremy Lee

WTA Tour Finals

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 29, 2017 Denmark's Caroline Wozniacki celebrates with the trophy after winning the final against USA's Venus Williams REUTERS/Jeremy Lee

WTA Tour Finals

Tennis - WTA Tour Finals - Singapore Indoor Stadium, Singapore - October 29, 2017 Denmark's Caroline Wozniacki celebrates with the trophy after winning the final against USA's Venus Williams REUTERS/Jeremy Lee

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Williams reacts. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Williams reacts. REUTERS/Thomas Peter

Tennis - Australian Open - Melbourne, Australia

Tennis - Australian Open - Melbourne, Australia, January 15, 2018. Venus Williams of the U.S. leaves following a news conference after losing her match. REUTERS/Edgar Su

Tennis - Australian Open - Melbourne, Australia

Tennis - Australian Open - Melbourne, Australia, January 15, 2018. Venus Williams of the U.S. reacts during a news conference after losing her match. REUTERS/Edgar Su

Tennis - Australian Open - Melbourne, Australia

Tennis - Australian Open - Melbourne, Australia, January 15, 2018. Venus Williams of the U.S. reacts during a news conference after losing her match. REUTERS/Edgar Su TPX IMAGES OF THE DAY

Tennis - Australian Open - Melbourne, Australia

Tennis - Australian Open - Melbourne, Australia, January 15, 2018. Venus Williams of the U.S. reacts during a news conference after losing her match. REUTERS/Edgar Su

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic and Williams shake hands after Bencic won their match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic and Williams shake hands after Bencic won their match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic and Williams shake hands after Bencic won their match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Williams reacts. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic hits a shot. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic and Williams shake hands after Bencic won their match. REUTERS/Thomas Peter TPX IMAGES OF THE DAY

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic and Williams shake hands after Bencic won their match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Williams hits a shot. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Williams leaves after losing her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Williams reacts after losing a point. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic and Williams shake hands after Bencic won their match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Williams leaves after losing her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic hits a shot. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter TPX IMAGES OF THE DAY

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland Rod Laver Arena, Melbourne, Australia, January 15, 2018. Williams hits a shot. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic reacts after winning a point. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Bencic celebrates after winning her match. REUTERS/Thomas Peter

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia

Tennis - Australian Open - Venus Williams of the U.S. v Belinda Bencic of Switzerland - Rod Laver Arena, Melbourne, Australia, January 15, 2018. Williams leaves after losing her match. REUTERS/Thomas Peter