Madison Keys' coach Bjorn Fratangelo likened the prospect of facing Aryna Sabalenka to staring down Novak Djokovic, Serena Williams and Roger Federer at their best.
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'Don't boo': Zverev's classy act as crowd turns on DjokovicHaving just taken the first set, Alexander Zverev was stunned by Novak Djokovic's retirement. But he was more shocked by the ...
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