Polish tennis player Jerzy Janowicz has kicked off his preparations for the 2018 season.
The 27-year-old underwent a knee surgery and laser vision correction last month.
Injury-plagued Janowicz has had knee problems in the past as well.
The Pole has been doing some gym sessions so far this offseason as he can't still practice with a racket.
Janowicz's 2017 season came to an end in November following his Bratislava Challenger quarter-finals retirement.
The Pole went all the way at the Bergamo Challenger and ended runner-up at the Eckental Challenger this past season.
Jerzy Janowicz is back to practising after knee surgery. Can't practise with racquet just yet. https://t.co/iGmDn0o4Nx
— Dead Net Cord (@MqLeo) 11 декабря 2017 г.
Janowicz started the year ranked at No. 280 but has since improved to No. 123.
Janowicz hasn't enjoyed much success since his 2013 breakthrough campaign.
The Pole just narrowly lost to eventual champion Andy Murray in the 2013 Wimbledon semi-finals and reached his career-high ranking of No. 14 the same year.
It remains to be seen can Janowicz storm back onto the big scene next year and become one of the best in the game yet again.