Sinner: "I am still not comfortable with my new serve, but I improve every day"

Despite adding another straight sets victory, the Italian analyzed his own evolution on the court, where he is looking to move some pieces and add new ones.

Fernando Murciego | 24 Oct 2025 | 22.02
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Jannik Sinner analyzes the adjustment with his new serve. Source: Getty
Jannik Sinner analyzes the adjustment with his new serve. Source: Getty

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Jannik Sinner achieved his goal in the quarterfinals of the ATP 500 in Vienna: to win the match without dropping a set, just as he had done in the previous two rounds. However, there is still something he needs to improve.

Although it may not always be evident from the outside, the reality is that Jannik Sinner is going through a period of change. More than a change, it is a phase of evolution, of improvement, of adding new elements to his game to make him less predictable. At the ATP 500 in Vienna, where he has now reached the semifinals, the Italian has been unstoppable in his three matches so far. However, he acknowledges that there is still work to be done. In statements captured by colleagues from Ubitennis, the current world No. 2 analyzed how he is experiencing this stage, as well as revealing what Bublik said to him after the match point.

Another victory for Jannik against Bublik

"Regardless of what the scoreboard says, it has been a very tough match from the start. Facing Sacha in the quarterfinals of an ATP 500 event will always be a challenge, so I am very pleased with the result. I tried to return as many balls as I could against his serve; I felt he was serving really well. I had the first chances in the opening set but didn't capitalize on them. However, I tried to stay mentally strong. I am proud of that, happy to be in another circuit semifinal. I know Alexander well, I know how dangerous he can be, so I tried to stay as solid as possible throughout the match."

What was said between Sinner and Bublik at the net?

"Well, I simply congratulated him on the great season he has had, probably the best of his career. He responded with confirmation, saying it was true, but that he could have done even better if we hadn't faced each other so many times (laughs). In the end, we know each other well, even beyond the courts and tournaments. I can only wish him the best for the future; I believe he has recently changed his mentality a lot, working much harder than before, hence the very good results reflecting his evolution."

Jannik Sinner during the ATP Vienna 2025 tournament. Source: Getty

 

Jannik Sinner explains how his serve is changing

"There is no secret, just practicing and training a lot. Sometimes you have to be brave, that's also true, so I'm still trying to understand how to implement these changes, the new rhythms. It's necessary to improve, to change things; I'm happy with how I served today. It's certainly a shot I don't feel comfortable with yet, not very confident, but I feel I improve a little more each day. For instance, today I achieved high percentages."

Confident in continuing to advance in Vienna

"I am very pleased with my performance; we will try to progress further in the tournament, to keep pushing each day. The next match will be very tough again, perhaps even more challenging as Alex has been playing excellent tennis for a while now. We met a few weeks ago in Beijing, and it was a close match; anything could have happened. So, I hope this will be another tough and physical encounter. We'll see what the future holds."

This news is an automatic translation. You can read the original news, Sinner: “Todavía no estoy cómodo con mi nuevo saque, pero mejoro cada día"