TORONTO -- Top-seeded Alexander Zverev of Germany beat Matteo Arnaldi of Italy 6-7 (5), 6-3, 6-2 on Thursday night in the third round of the National Bank Open.
The third-ranked Zverev ended up as the top seed with top-ranked Jannik Sinner and No. 2 Carlos Alcaraz skipping the hard-court event that still has a week left. No. 5 Jack Draper and No. 6 Novak Djokovic also are absent.
Zverev advanced to face No. 14 Francisco Cerundolo of Argentina, a 6-3, 6-4 winner over countryman Tomas Martin Etcheverry. The German star won the BMW Open on clay in Munich in April for his 24th ATP Tour title.
Earlier, Alex Michelsen of the United States upset third-seeded Lorenzo Musetti of Italy 3-6, 7-6 (4), 6-4. Michelsen will face fellow American Learner Tien, a 7-6 (3), 6-3 winner over American Reilly Opelka.
Fifth-seeded Holger Rune of Denmark advanced in a night match, beating Alexandre Muller of France 6-2, 6-4. Rune will play Alexei Popyrin of Australia, a 5-7, 6-4, 6-4 winner over 10th-seeded Daniil Medvedev of Russia in the final match of the night.
Eighth-seeded Casper Ruud of Norway topped Nuno Borges of Portugal 7-5, 6-4 to set up a match with 11th-seeded Karen Khachanov of Russia. Khachanov beat Emilio Nava of the United States 6-7 (6), 6-4, 6-1.