Goran Ivanisevic has become Tomas Berdych's coach.
Berdych says on Twitter that "Goran, with his playing and coaching experience, as well as his energy, is a perfect addition to the team."
Berdych fired his previous coach Dani Vallverdu in May and has trained the last two months with Luka Kutanjac.
Ivanisevic will join Berdych in Cincinnati for the Western & Southern Open tournament, which starts Sunday.
The 30-year-old Berdych led the Czechs to two Davis Cup titles but has never won a Grand Slam tournament. He was a runner-up at Wimbledon in 2010 and reached his highest ranking at No. 4 last year.