Do you know that brand? He was wearing the complete outfit, even the jacket, so it did look like a sponsored outfit.
Interesting that he is wearing that brand. The only other player I can recall that wears it is Chiudinelli. Nice he has a sponsor now, though.
This is the company's website:
Interestingly enough this company was founded by former Swiss player Ivo Heuberger.
They also produce the Swiss Davis Cup clothes, which is funny as it is the only area of the website devoted to tennis. There is no section solely on their tennis clothes