Alex Zverev given warning after using phone to take photo of disputed ball mark in Madrid Open victory
By Matias Grez, CNN (CNN) — Alex Zverev was given a warning for unsportsmanlike conduct after using his phone to take a photo of a disputed ball mark in the middle of his 2-6, 7-6(3), 7-6(0) win over Spain’s Alejandro Davidovich Fokina. In the 10th game of the second set, Zverev was left bemused after
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