“Maybe he doesn't have the biggest name in the game because he wasn't No. 1 in the world himself or has coached 15 other top guys,” Federer said.
“I don't think you necessarily need that to be a good coach,. He gives everything he has every day, and people still think he's a part‑time coach, which he's obviously not because he's traveled the last two, three years with me now full time. He's also Davis Cup captain, so he has a lot of experience by now. It works really well with me. Also in tougher times, which we had to go through the last three years, he's always been very positive.”