Russian world number eight Andrey Rublev said Wimbledon's ban on Russian and Belarusian players is "complete discrimination" and "illogical".
Rublev is one of three top-10 players - along with fellow Russian Daniil Medvedev and Aryna Sabalenka of Belarus - who cannot play at SW19 this summer.
Wimbledon made the decision to ban Russian and Belarusian players because of the invasion of Ukraine.
"The reasons they gave us had no sense, they were not logical," said Rublev.
"What is happening now is complete discrimination against us."
Rublev's comments to the AFP news agency came after the 24-year-old won 4-6 7-6 (7-1) 6-2 against Czech opponent Jiri Lehecka at the Belgrade Open.