Top-seeded Alexander Zverev led Francisco Cerundolo 6-4, 1-0 when the 14th-seeded Argentine retired because of an abdominal injury Saturday night in the National Bank Open.

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El máximo preclasificado Alexander Zverev venció el jueves 6-7 (5), 6-3, 6-2 al italiano Matteo Arnaldi para avanzar a los octavos de final Abierto de Toronto. Fue