Coach Ivan Ljubicic insisted Roger Federer was really pleasant to work with and added Federer always wanted to hear the truth and nothing else. Ljubicic started working with Federer in 2016 as he was a part of the Federer's until the end of the 41-year-old's career.
"Easy! Easy because he makes it easy for coaches. He is really open and makes sure you have freedom. You are comfortable and you feel you can say whatever you think is right and the way it is," Ljubicic told Eurosport.
"He always said 'I don't want to hear from you what you think I want to hear - I want to hear what you really think; I want to hear the truth' He repeated that multiple times, really making sure that we as coaches - or at least me as a coach - really felt free and comfortable.
It was always that. There were many moments where I just wouldn't have anything to say because he was just perfect. Really, there were some practices that were ridiculous! I would just give him balls and just say 'you are good!' but we had some tough ones as well, some tough times, and difficult moments, but most of the time it was just very, very enjoyable."
Ljubicic, Federer won three Grand Slams as a duo
After undergoing a knee surgery in the summer of 2016, Federer was written off by many. Then, he won three Grand Slams in the next 12 months. First, Federer won the 2017 Australian Open title, which at the time was his first Grand Slam since 2012 Wimbledon.
Then, Federer made it all the way at 2017 Wimbledon. At the start of the 2018 season, Federer defended his Australian Open title and clinched his 20th and final Grand Slam title. Ljubicic's partnership with Federer was a success since Federer won three Grand Slams and there was a period when he was the top-ranked player in the world.