Stanislas Wawrinka says he is pleased with how he is feeling physically after reaching the semi-finals of the World Tennis Tournament in Rotterdam.
The Swiss star appears to be back to his best after struggling to recover from the two knee operations in endured in 2017.
He defeated the Canadian 10th seed Denis Shapovalov 6-4 7-6 to set up a semi-final against Kei Nishikori.
"Physically I feel really good and I am moving and feeling better match after match," said Wawrinka afterwards.
"It was a tough match. I had to really fight at the end. I was a bit nervous at the end of the match. We had some long rallies. It is good to see that I can keep being there, mentally, physically."
Nishikori easily defeated Hungary's Marton Fucsovics 6-3 6-2, while Daniil Medvedev outclassed Jo-Wilfried Tsonga, triumphing against the Frenchman 6-4 6-2.
Medvedev will face Gael Monfils, who beat Bosnia's Damir Dzumhur 6-1 6-2, in the semi-finals.
Medvedev is in good form and won the fourth ATP Tour title of his career last week at the Sofia Open.
He said after reaching the last four in Rotterdam: "It feels a little bit strange, as I didn't think I played that well. But I managed to work hard. I don't think Jo was happy with his level either, as we've both played a lot of matches."
Wawrinka is 11/4 to win the World Tennis Tournament while Medvedev can be backed at 2/1.
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