London — World number one Novak Djokovic produced a rock-solid performance to dismantle the challenge of German firebrand Alexander Zverev at the ATP Finals on Wednesday. The Serb, 10 years older than his opponent, was made to work hard in an absorbing first set but Zverev’s challenge crumbled at the O2 Arena as Djokovic won 6-4 6-1 to move within sight of the semi-finals. Five-times champion Djokovic, who will end the year as world number one for the fifth time in his career after a storming second half of the season, leads the Gustavo Kuerten group with two wins and is yet to drop a set. He will advance into the last four of the season-ending tournament for the eighth time if John Isner beats Marin Cilic in the evening session. “I don’t think it was breathtaking tennis from both of us but a win is a win,” Djokovic, who hit only three winners in the first set compared to Zverev’s 15, said on court. “I started to play better in the second set and he was making a lot of unforced erro...

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