Aryna Sabalenka takes photo of ball mark to dispute umpire’s call during Stuttgart Open victory

World No. 1 Aryna Sabalenka was so sure that the umpire had made an incorrect call during her Stuttgart Open quarterfinal victory over Elise Mertens that she used a mobile phone to photograph the mark left by the ball.

​ World No. 1 Aryna Sabalenka was so sure that the umpire had made an incorrect call during her Stuttgart Open quarterfinal victory over Elise Mertens that she used a mobile phone to photograph the mark left by the ball. Read More Breaking News, Latest News and Videos | CNN