Why did Rune play with a black-painted racket?

Eliminated in the second round of the US Open, Holger seems aware of the improvements he needs to make. While Marco Panichi, former coach of Djokovic and Sinner, joined the Dane's team some time ago, the world number 11 has also made another change.
Indeed, following the end of his collaboration with Babolat, his racket brand, the 22-year-old player decided to test new models. This initiative explains the black color of his racket during his Davis Cup training sessions.
"It's no secret, I'm going to try to see how I feel in the upcoming competitions (Davis Cup and Laver Cup), and then we'll see in the future. I trained with the new racket right after the US Open, so I've already gotten somewhat used to it.
In my opinion, it's the perfect time to do it, because I don't want to find myself later in the year having to think about what I'm going to play with," he said before the match against Spain.
This color is common among tennis players, as it serves to conceal the new models or brands they are testing, keeping the details secret from competitors and fans. This helps avoid speculation while evaluating performance without revealing the specifications.