Stan Wawrinka is determined to try and regain the heights which have seen him win three of the four Grand Slam titles on offer.
The 32-year-old Swiss needs only a Wimbledon crown to complete a full set of Grand Slam titles, but he is currently in the process of continuing his battle back from a serious knee injury, which required surgery and which saw him miss the second half of 2017.
My main goal is to come back at my top level physically and tennis-wise.Stan Wawrinka
He was able to feature at the recent Australian Open, but was clearly far from fully fit and fell in round two to Tennys Sandgren, who went on to reach the quarter-finals.
Now he is set to feature at the Sofia Open and is happy with the way things have gone since he left Melbourne.
He told the official Sofia Open website: "I am feeling better and better and starting to come back to my top level.
"For me, it was really important mentally, but as well - for my knee to see that everything is going in the right direction. I knew I wasn't ready to play in a good level (in Australia) and physically I was still far away from I want to be.
"My main goal is to come back at my top level physically and tennis-wise, but I know it was really tough to be out for six months. Big surgeries take time to come back.
"When I feel ready for everything, then I will try to see what more I can achieve."
Having won the title in 2015, Wawrinka is 33/1 to secure a second French Open success later this year, with Rafael Nadal priced at 2/5 and Dominic Thiem 8/1.
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