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,

The 2017 champion in Canada will now play Italian Matteo Arnaldi, who  defeated qualifier Tristan Schoolkate 6-3, 3-6, 6-3.Number eight Casper Ruud put out Roman Safiullin 6-3, 6-3 for another seeded win.

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.