Top-seeded Alexander Zverev led Francisco Cerundolo 6-4, 1-0 when the 14th-seeded Argentine retired because of an abdominal injury in the National Bank Open.
Zverev to face Popyrin in Toronto quarterfinals
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- Astros’ Paredes to forgo season-ending surgery
- Mohammed Amir, Imad Wasim signed as Hundred replacements