TORONTO (AP) — Top-seeded Alexander Zverev of Germany 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.
Zverev advanced to face defending champion Alexei Popyrin of Australia in the quarterfinals. The 18th-seeded Popyrin beat fifth-seeded Holger Rune of Denmark 4-6, 6-2, 6-3 in the first night match.
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Alex Michelsen of the United States celebrates on his way to defeating Learner Tien of the United States at the National Bank Open in Toronto, on Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Karen Khachanov of Russia celebrates on his way to defeating Casper Ruud of Norway at the National Bank Open in Toronto, on Saturday Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Holger Rune of Denmark pumps his fist after holding serve against Alexei Popyrin of Australia during their match at the National Bank Open in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexei Popyrin, of Australia, chases down a shot from Holger Rune, of Denmark, during their men's match at the National Bank Open tennis tournament in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexei Popyrin, of Australia, hits a backhand return to Holger Rune, of Denmark, during their men's match at the National Bank Open tennis tournament in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexander Zverev of Germany hits a backhand return to Francisco Cerundolo of Argentina during their match at the National Bank Open in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexander Zverev of Germany hits a forehand return to Francisco Cerundolo of Argentina during their match at the National Bank Open in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alex Michelsen of the United States celebrates on his way to defeating Learner Tien of the United States at the National Bank Open in Toronto, on Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Karen Khachanov of Russia celebrates on his way to defeating Casper Ruud of Norway at the National Bank Open in Toronto, on Saturday Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Holger Rune of Denmark pumps his fist after holding serve against Alexei Popyrin of Australia during their match at the National Bank Open in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexei Popyrin, of Australia, chases down a shot from Holger Rune, of Denmark, during their men's match at the National Bank Open tennis tournament in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexei Popyrin, of Australia, hits a backhand return to Holger Rune, of Denmark, during their men's match at the National Bank Open tennis tournament in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Zverev, the 2017 champion ranked third in the world, ended up the top seed with top-ranked Jannik Sinner — the 2023 winner — and No. 2 Carlos Alcaraz skipping the hard-court event that ends Thursday. No. 5 Jack Draper and No. 6 Novak Djokovic also sat out.
Zverev won on clay in Munich in April for his 24th tour title.
Alex Michelsen reached the quarterfinals in the afternoon, topping fellow American Learner Tien 6-3, 6-3. Michelsen will face 11th-seeded Karen Khachanov of Russia, a 6-4, 7-5 winner over eighth-seeded Casper Ruud of Norway.
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Alex Michelsen of the United States celebrates on his way to defeating Learner Tien of the United States at the National Bank Open in Toronto, on Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Karen Khachanov of Russia celebrates on his way to defeating Casper Ruud of Norway at the National Bank Open in Toronto, on Saturday Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Holger Rune of Denmark pumps his fist after holding serve against Alexei Popyrin of Australia during their match at the National Bank Open in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexei Popyrin, of Australia, chases down a shot from Holger Rune, of Denmark, during their men's match at the National Bank Open tennis tournament in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexei Popyrin, of Australia, hits a backhand return to Holger Rune, of Denmark, during their men's match at the National Bank Open tennis tournament in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexander Zverev of Germany hits a backhand return to Francisco Cerundolo of Argentina during their match at the National Bank Open in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexander Zverev of Germany hits a forehand return to Francisco Cerundolo of Argentina during their match at the National Bank Open in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alex Michelsen of the United States celebrates on his way to defeating Learner Tien of the United States at the National Bank Open in Toronto, on Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Karen Khachanov of Russia celebrates on his way to defeating Casper Ruud of Norway at the National Bank Open in Toronto, on Saturday Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Holger Rune of Denmark pumps his fist after holding serve against Alexei Popyrin of Australia during their match at the National Bank Open in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexei Popyrin, of Australia, chases down a shot from Holger Rune, of Denmark, during their men's match at the National Bank Open tennis tournament in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
Alexei Popyrin, of Australia, hits a backhand return to Holger Rune, of Denmark, during their men's match at the National Bank Open tennis tournament in Toronto, Saturday, Aug. 2, 2025. (Frank Gunn/The Canadian Press via AP)
