(Reuters) -Alexander Zverev is convinced there was a defect in the electronic line calling system during his Madrid Open win on Sunday after the German risked a hefty fine by pulling out his phone to take a photograph of a contested call.
The top seed overcame Alejandro Davidovich Fokina 2-6 7-6(3) 7-6(0) to reach the last 16 of the claycourt tournament but was frustrated by an incident in the second set when a backhand from his opponent was called in by the tracking technology.
