Alexander Zverev advanced to the quarter-finals of the Cincinnati Masters on Wednesday after Russian opponent Karen Khachanov retired in the second set with the score at 7-5, 3-0 in Zverev's favour.

World number one Aryna Sabalenka cruised into the Cincinnati Open quarter-finals with a 6-1 7-5 victory over Jessica Bouzas Maneiro while men's top ...