LONDON, ENGLAND - JUNE 28: Serena Williams of USA shouts out with anxiety during her first round match against Amra Sadikovic of Switzerland at Wimbledon on June 28, 2016 in London, England. (Photo by Visionhaus/Corbis via Getty Images)
LONDON, ENGLAND - JUNE 28: Serena Williams of USA shouts out with anxiety during her first round match against Amra Sadikovic of Switzerland at Wimbledon on June 28, 2016 in London, England. (Photo by Visionhaus/Corbis via Getty Images)