Former British No. 1 tennis player Greg Rusedski has said that Roger Federer is unlikely to win another Grand Slam in his already decorated career. 

Sixth-seeded Stefanos Tsitsipas, who eventually won the tournament, defeated Federer at the ATP Finals' semi-final round in London.

While there was a 17-year gap of experience between Federer and Tsitsipas, the latter saved 11 out of 12 break point chances and converted on three out of the four opportunities he had received to conquer over the six-time champion.

Following a near-perfect performance that helped Federer thrash World No. 2 Novak Djokovic in their must-win Round-Robin match in London, the Swiss Master ended up leaking too many errors against Tsitsipas and according to Rusedski, the "pressure" took a toll on Federer. 

Switzerland's Roger Federer failed in his bid to win a seventh ATP Finals title Switzerland's Roger Federer failed in his bid to win a seventh ATP Finals title Photo: AFP / Daniel LEAL-OLIVAS

Asked just a day after Federer's loss to Tsitsipas if the 20-time Grand Slam champion can clinch another major trophy, Rusedski, a former World No. 4, replied, "I don't think so."

"There were expectations. All of a sudden he played that magical match against Novak Djokovic and everybody began to say 'Roger Federer is going to win the title'. There is pressure put on you and the older you get, to deal with pressure becomes difficult. There is nobody who's played ever as well as Roger Federer at 38. [But] he's human and the breakpoint chances were the key, the big points," Rusedski, who is also an Amazon Prime pundit, added. 

Rusedski, who was awarded the BBC Sports Personality of the Year Award in 1997 for finishing as runner's up that year at the US Open, also mentioned that he would be happy if Federer proved him wrong as it would be great for tennis.

"I think that Wimbledon final with two match points was his big moment. If he proves me wrong I will be very happy because I think it will be great for our game," Rusedski added.