Angelique Kerber is the only Grand Slam singles winner still on track in the Australian Open women's draw. On the men's side, Roger Federer is in cruise control.
Zverev broke his racket in his loss to Fernando Verdasco as Juan Martin del Potro marked his return to the tournament after five years. Seventh seed Johanna Konta tumbled out to 109th ranked Hsieh Su-Wei from Taiwan.
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