The challenge system is proving, well, challenging for the top men at the Australian Open. No. 4-ranked Andy Murray asked for five line calls to be reviewed by video technology in his quarterfinal against Kei Nishikori on Wednesday and failed on every one. No. 2 Rafael Nadal and No. 6 Tomas Berdych challenged a combined 20 calls the previous evening and got eight right.
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Topics: Tennis