Stanislas Wawrinka is on course for a planned 2018 comeback after returning to training from a four-month knee injury absence.

Wawrinka makes training comeback

Wawrinka makes training comeback

The 32-year-old three-time Grand Slam champion has been sidelined since crashing out of Wimbledon against Russian debutant Daniil Medvedev at the first round stage in July.

Wawrinka, who had reached the semi-finals at the Australia Open and lost to Rafael Nadal in the French Open final in June, confirmed that the knee injury required surgery and would rule him out for the remainder of the year and subsequently prevented him from defending his US Open crown.

However, the Swiss has been working hard on his recovery and took to Twitter to confirm that he is now back on the court to work on his game and further build up his fitness levels.

"First practice since July! Sooooo happy and excited!! Already killing the cones with the backhand!" he tweeted.