Andrey Rublev has been praised as a "very calm" and "very warm" person by his advisor and assistant coach Alberto Martin.

World No. 6 Rublev has had a successful few weeks on the ATP Tour, reaching the quarter-finals at the US Open in early September, before going on to win the Ultimate Tennis Showdown in Frankfurt.

The Russian added Martin to his team this year. The Spanish former tennis player previously praised Rublev's kindness toward others and his dedication to his fans earlier in the season when he was competing at the Miami Open.

"Andrey Rublev is very calm and very warm. He does things that I haven't seen many times in my life. He comes out of practice and signs autographs for everyone, all the people who are waiting. I remember that he came out of the game in Dubai and signed 45 minutes..." Martin said.

He added that he had tried to tell the 25-year-old that he needed to 'cool down' a bit, but Rublev wanted to indulge his fans.

"I told him: 'Man, you have to cool down', but he doesn't want to leave anyone without a signature. He says that it is part of his legacy, of what he wants to represent. He wants the fans to be happy. So we respect it," he added.

Martin continued by saying that Rublev was respected off the court by his colleagues and that even his clothing line "Rublo" was started to 'leave a message' rather than for commercial reasons.

"In the locker room he is very loved by his [colleagues]. Everyone says that he is a very nice guy. And on the track he is very legal. He also surprised me that he launched his clothing brand," Martina said. "The motto is 'play for the kids, play for the light'. And he has not done it on a commercial level but because he wanted to leave a message," he continued.