Roger Federer has been working with coach Severin Luthi since 2007
Luthi has been working with Federer for more than a decade and, alongside Ivan Ljubicic, guided him to two Grand Slam titles in 2017.
The Swiss player had taken the second half of 2016 off to deal with knee and back injuries, returning to win the Australian Open and Wimbledon to take his career tally to 19 Grand Slams.
And the 36-year-old paid tribute to Luthi’s influence both as a coach and a person in his camp.
“Congratulations on coach of the year in Switzerland,” Federer said on Twitter.