Novak Djokovic is looking forward to the knockout stages of the ATP World Tour Finals after finishing top of Group A with a perfect record.
The Serbian made it three wins from three in the round-robin stage in London by beating Tomas Berdych 6-2 7-6 (8-6) on Friday afternoon, a result that eliminates the Czech from the tournament.
In contrast Djokovic is now safely through to the semi-finals where he could still face defending champion Roger Federer.
"I just try to have simple thinking, to fight for every point," the world number one said. Sometimes it doesn't work. I'm glad it worked today.
"For the first time I've won all three matches in my group. This is very encouraging for me, so I will try to focus on the semi-final now."
Djokovic had arrived at the O2 Arena off the back of an early exit at the Paris Masters, while he then dashed back to Belgrade to visit his sick father, Srdjan, who is now recovering from a respiratory illness.
"It was (difficult)," he said. "It still is. But there's good news every day. That makes me happier, makes me play more relaxed on the court.
"I switch off on the tennis court. I try to think only about the match. And it's been working well so far."
Berdych, meanwhile, was left to look back on what could have been after squandering a 5-1 lead in the second set tie-break.
"I had some chances in the tie-break. If I had been able to make it, tried to push him for the third set, then maybe I would have got another chance. But it didn't happen. It wasn't one of my best matches with him," he said.
But while his bid for glory in the English capital is now over the fifth seed still has a Davis Cup final left on his schedule; the Czech Republic have home advantage next weekend when they welcome Spain to Prague.
"I'm just going to try to prepare myself as best as I can for that event," he added.
"I think this is the better option, to play with the tough guys. Even if you win or not, I think it's better to have a week like this than play some small tournament. I hope that the best moment is still to come."