Alexander Zverev, the youngest player in the ATP Top 50, has started working with former world No. 1 Juan Carlos Ferrero.
The No. 11 has been training with his new coach in Florida before the ATP event in Washington, D.C, next week.
Ferrero reached No. 1 and won the French Open in 2003, when he was also a finalist at the US Open. He now runs the Juan Carlos Ferrero Equelite Academy in Spain, which trains aspiring players and is used by ATP pros like Pablo Carreno Busta.
Ferrero, who has assisted other players but has not previously been a touring coach, sees a lot of potential in the 20-year-old German.
"Zverev is a different player, he has the manner of a champion," Ferrero said. "It's a task I'm keen to take on and do the best that I can."
Zverev's father, Alexander Sr., will also keep coaching him, and his older brother, Mischa, is a top 30 player on tour.
He was won three titles this season, including the Masters event in Rome, and broken into the top 10 for the first time in his career after reaching the fourth round in Wimbledon.