Zverev given code violation after taking a picture to dispute ball mark

Zverev disputed whether hawk-eye was working after a close line call in his win over Davidovich Fokina

Ruud overpowers Korda to make Madrid last 16

Mensik beats Shelton in straight sets to advance

Svitolina sees off Rybakina to set up Round of 16 clash with Sakkari in Madrid

Fritz through as Bonzi retires after two sets

Zverev overcomes scare to beat Fokina and reach last 16