The former top 25 player has hit out at Rublev who has branded the ban as 'complete discrimination.'
Andrey Rublev won a second consecutive ATP title after beating Jiri Vesely in the final of Dubai.
After losing to his Canadian rival last week, Rublev has turn the tables to win his first Tour title in almost a year.
Rublev has become the fifth player to test positive for the virus after playing in the Mubadala World Tennis Championship.
Casper Ruud is the first Norwegian in history to reach the last four at the Nitto ATP Finals.
UbiTennis has a closer look at the eight contenders for the trophy in Turin this year.
Here is a full list of players who have been nominated to play in the team event next month.
Kei Nishikori secured a big win at his home Olympics by beating Andrey Rublev.
The Greek produced some brilliant tennis in Monte Carlo and also had some luck on his side. The question is how will Novak Djokovic, Rafael Nadal...
The world No.8 takes confidence from his latest run but admits it is 'impossible' to play at his very top level every week on the Tour.
The 22-year-old produced a clinical performance to clinch the biggest clay court title of his career to date.
Rafael Nadal was disappointed in his serve as he was beaten by Andrey Rublev in Monte-Carlo.
The world No.8 gives an honest assessment on his chances of winning his first Masters title.
Andrey Rublev says he won’t have one if it was his choice and Aryna Sabalenka has concerns over the manufacturing process. On the other hand, others...
The world No.8 says the upcoming tournament will be a 'great challenge' following the withdrawal by a series of players.
A series of rules implemented to help players during the COVID-19 pandemic are making some feel they are at a disadvantage.
Despite being one of the Tour's more in-form players, the 23-year-old explains why he has doubts about achieving success in his latest tournament.
The world No.50 shares his opinion of the Russian ahead of their clash in Doha.
The Russian and world number 8 won the title in Rotterdam beating his Hungarian opponent in straight sets.
The Russian world number 8 booked his spot in the final eight after beating the Scott in rather convincing fashion.