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.

Alexander Zverev made it through to the last eight of the Toronto Masters after Francisco Cerundolo retired due to injury at 6-4, 1-0 on Saturday. The world number three had not won any of his three previous matches against Cerundolo,

El alemán Alexander Zverev, primera cabeza de serie, lideraba 6-4, 1-0 cuando el argentino Francisco Cerúndolo (14), se retiró debido a una lesión