Federer is doing very well. The goal is to win big titles', says his coach
Roger Federer could miss his final competitive appearance
The Man Behind Federer's Fitness - The New York Times
Roger Federer Can Achieve 'Good Results' On The Clay, Says Trainer - UBITENNIS
Fitness trainer reveals key behind Roger Federer, Stan Wawrinka's longevity
The highly emotional message from Severin Lüthi to Roger Federer · tennisnet.com
Exclusive: Ivan Ljubicic reveals what coaching Roger Federer is like and says legend 'is not going anywhere' - Eurosport
Roger Federer reveals major change on-court after year out of spotlight
Federer Hires Ljubicic As New Coach - Perfect Tennis
Roger Federer Plays Hide And Seek With Coach & Fitness Trainer Ahead of his Opening Game Against Steve Johnson in Australian Open 2020 (Watch Video) | 🎾 LatestLY
Roger Federer's coach hints at next move after retirement with Stan Wawrinka example | Tennis | Sport | Express.co.uk