Four days into the expanded National Bank Open and the men’s draw has already been blown wide open.
Home favourite Félix Auger-Aliassime was forced to withdraw with a back injury before striking a ball, while top seed Alexander Zverev, fourth seed Daniil Medvedev and seventh seed Taylor Fritz all suffered surprise defeats as another wave of seeded players exited Montreal.
The latest upsets mean just two of the tournament’s top 10 seeds remain standing before the third round, a remarkable statistic for a two-week Masters 1000.
João Fonseca continued his rise with a solid win over Stefanos Tsitsipas, Daniel Mérida Aguilar claimed the biggest victory of his young career, while Tallon Griekspoor and Botic van de Zandschulp spearheaded an outstanding day for Dutch tennis.
Whether it’s the expanded two-week format, the quick turnaround after Wimbledon and Washington, or simply a week full of inspired underdog performances, Montreal is already looking like a damp squib, which doesn’t help its debated reputation as a premier event on tour.
Here’s a look at the key results and standout matches from day four in Montreal.
Day Four National Open 2026 Round of 64 Results
Key Match Recap
Tallon Griekspoor def. Alexander Zverev 6-7(3), 6-2, 6-4
Tallon Griekspoor pulled off one of the biggest upsets of the tournament, recovering from a first-set tie-break defeat to eliminate top seed Alexander Zverev.
The Dutchman had arrived in Montreal on the back of a poor run of form, winning just one of his previous eight tour-level matches, and given his 2-9 H2H vs Sascha, I didn’t really see him winning this one.
But then again, we’re at the Canada Open where nobody really seems to care about the tournament, so results often flip the script, and after watching some highlights of their previous matches, I realised the 9-2 was rather flattering, as Griekspoor could easily have won a few of those matches.
Against Zverev, he was the more aggressive player for long spells, striking 20 forehand winners and winning 17 of his 18 approaches to the net.
The third set could have been even more comfortable, but Griekspoor surrendered a break advantage in the deciding set to allow Zverev back to 4-4, but he held his nerve, breaking immediately before serving out one of the biggest victories of his career.
Botic van de Zandschulp def. Daniil Medvedev 6-3, 7-6(5)
Botic van de Zandschulp continued the Dutch celebrations by producing another upset, defeating fourth seed Daniil Medvedev in straight sets.
Van de Zandschulp played one of his cleanest matches of the season, mixing pace and height cleverly to keep Medvedev uncomfortable throughout.
After dominating the opening set, he raced into a 3-0 lead in the second before the Russian fought back to force a tie-break.
It was Van de Zandschulp’s ninth career Top 10 win and his first since defeating Novak Djokovic at Indian Wells last season.
I didn’t particularly have high hopes for Meddy as he was pictured with both knees taped during a pre-tournament practice and his form isn’t anything to write home about.
Thiago Agustín Tirante def. Taylor Fritz 7-5, 6-3
Thiago Agustín Tirante claimed another seeded scalp by knocking out seventh seed Taylor Fritz in straight sets.
Fritz never looked comfortable after winning the Washington title just 48 hours earlier and required a medical timeout during the second set as his movement visibly deteriorated.
The Argentine played aggressively without becoming reckless, struck 19 winners and remarkably lost just one point behind his first serve throughout the entire match.
João Fonseca def. Stefanos Tsitsipas 7-6(3), 7-5
João Fonseca made an impressive return from his post-Wimbledon break by defeating Stefanos Tsitsipas for the second time in his career.
The Brazilian controlled much of the match with his explosive forehand and looked set for a routine finish before failing to serve out the contest at 5-4 in the second set.
Rather than allowing frustration to creep in, the 19-year-old responded superbly, winning eight of the next nine points to wrap up victory.
A third-round clash with Casper Ruud should be interesting.
Alex Michelsen def. Francisco Cerúndolo 6-3, 6-4
Alex Michelsen continued his quietly excellent summer with another composed victory, this time eliminating 16th seed Francisco Cerúndolo.
The American controlled proceedings with aggressive first-strike tennis, taking time away from the Argentine and rarely allowing him to settle into extended rallies.
Michelsen doesn’t receive quite the same attention as some of his contemporaries, but his results are of similar quality.
Other Notable Results
Casper Ruud made light work of Juan Manuel Cerúndolo, while Ben Shelton began his title defence with a solid straight-sets victory over Jenson Brooksby.
Hubert Hurkacz continued his encouraging comeback by defeating Alejandro Tabilo, Jakub Menšík ended Jacob Fearnley’s run, Lorenzo Musetti overcame qualifier Nicolás Mejía after a tight opening-set tie-break, and Mariano Navone recovered from a set down to beat Valentin Vacherot.
Elsewhere, Rafael Jódar continued his breakthrough summer by fighting back to defeat Corentin Moutet, Arthur Fils advanced past Zachary Svajda, Cameron Norrie comfortably beat Ignacio Buse, Nuno Borges maintained his excellent Montreal record with victory over Tomás Martín Etcheverry, Tommy Paul edged Valentin Royer in two close sets, while Arthur Rinderknech outlasted Miomir Kecmanović in three sets.
Highlights
National Bank Open 2026 Day 5 Round of 32 Matches
- (8) Jiří Lehečka vs (27) Alexander Blockx
- (20) Rafael Jódar vs (11) Lorenzo Musetti
- Mariano Navone vs (18) Arthur Fils
- Cameron Norrie vs (3) Alex de Minaur
- Yannick Hanfmann vs Nuno Borges
- (19) Luciano Darderi vs Shang Juncheng (PR)
- (15) Frances Tiafoe vs (23) Arthur Rinderknech
- (28) Brandon Nakashima vs Titouan Droguet (Q)
