Alexander Zverev had a bizarre but also hilarious moment during his opening Toronto Masters match as the world No. 3 passionately celebrated what he thought was an ace on a set point. 

Leading 7-6 in the first-set tie-break against Adam Walton, the German – who is seeded at No. 1 at the Canadian Open – went for a big serve down the line. The three-time Grand Slam finalist instantly started celebrating, believing that he sealed the first set. But he was quickly corrected by the chair umpire, who shouted, "fault!" The 28-year-old was left in disbelief while the chair umpire and the crowd had a good laugh.

So good he thought he won it twice 😆@AlexZverev takes the opener 7-6 over Walton 🤝#NBO25 pic.twitter.com/8uAVtI6dGv

— Tennis TV (@TennisTV) July 30, 2025

However, Zverev remained calm and he did convert his set point at 7-6. Then, the top seed went on to complete a 7-6 (6) 6-4 win and progress into the Toronto Masters third round, where he plays against Matteo Arnaldi.

Zverev highlighted the importance of winning the first set

Before taking the tie-break, the Zverev trailed 3-5 and he was close to finding himself down by a set.

“It was a very important moment, very important point for me. Lucky to get through in the first set and finishing it off in two… Sometimes it’s about winning a match, [despite] not always playing your best. I know it wasn’t the prettiest match, for sure, but I haven’t played a match in four weeks. I took some time off, which I needed also for myself. I’m happy to be playing again. Tomorrow is another day and I hope I will be better tomorrow," the German said.

Against Arnaldi, Zverev has a 1-0 head-to-head record. However, their first meeting which came in Acapulco this year, was a very tight contest as the German had to come back from a set down to beat the Italian 6-7 (2) 6-3 6-4.