World number one Aryna Sabalenka took matters into her own hands and used a mobile phone to photograph a disputed ball mark when the umpire refused her request to take another look during her win over Elise Mertens at the Stuttgart Open on Saturday. Sabalenka looked bemused when an out call went against her to give Belgian Mertens the first service break and a 4-3 lead in the opening set of their quarter-final, and a check by umpire Miriam Bley confirmed the call. The Belarusian went to look