The much anticipated ATP World Tour Finals round robin clash is here as Roger Federer is set to face Novak Djokovic in London on Tuesday, which promises to be a stellar of a contest. Both the players come into this match with a spring in their stride as the Swiss ace defeated Tomas Berdych 6-4 and 6-2 while the world number one thrashed Kei Nishikori 6-1 and 6-1 in their respective opening matches.

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The rivalry between the two is one of the biggest in modern tennis with Djokovic having a great head-to-head record in 2015 against Federer, who has won twice and the Serbian, an impressive four times, which includes the Wimbledon and the US Open finals.

With such victories under his belt, Djokovic should be confident in defeating Federer, but with the Swiss ace at the other half of the court, it is not going to be an easy outing. If Federer comes up with his A-class game, the world number one might have to face the music as was witnessed in the 2015 Cincinnati Open finals where the former world number one defeated Djokovic in straight sets.

Tennis fans always love to see these players in action as they are the greatest players of the current generation. When they are pitted against one another, it is the quality of tennis that takes the centre stage irrespective of the results. The rivalry, which has been growing over the years, is expected to entertain the crowd in a jam-packed stadium in London.

"I think it's really become a very nice rivalry," ATP official website quoted Federer as saying.

"It seems people like the way we play against each other. I don't think we have to adjust our games very much against each other. We can just play our game, and then the better man wins. It's been nice seeing Novak's improvements over all these years."

When the rivalry between Djokovic and Federer was taking shape, the former looked second best against the Swiss champion, but now the Serbian has improved in all departments of the game, which has seen him clinch a number of titles. No wonder, he is the number one player in the world and dominating the circuit.

"He's (Djokovic) become such an unbelievable player, especially the last five, six years, and he's cleaned up his game so nicely and became the best mover in the game. It's really a pleasure playing against him every single time," added Federer.

Where to watch

Roger Federer vs Novak Djokovic ATP World Tour Final clash is set to begin at 8 pm local time (1.30 am IST, 3 pm ET). Viewers in India can watch Roger Federer vs Novak Djokovic clash on Star Sports 4/HD and Ten Sports and. Live streaming will be available on Ten Sports Live, Starsports.com, Hotstar.

Audience in the US can catch Roger Federer vs Novak Djokovic live action on Tennis Channel with live streaming on Tennis Channel Online. Viewers in the UK can watch Roger Federer vs Novak Djokovic live on Sky Sports 3/HD, with the live stream option on Sky Go.

Viewers from across the world can watch the Roger Federer vs Novak Djokovic live on ATP's official website.