LONDON - London’s farewell edition of the ATP Finals could still have its dream climax after world number one Novak Djokovic beat Alexander Zverev 6-3 7-6(4) to seal a last-four spot on Friday. Defeat by Russian Daniil Medvedev had left the five-time champion needing to beat Germany’s Zverev to avoid a group stage exit and he obliged with a relatively comfortable win. Djokovic will finish second in the Tokyo Group, named after the first edition of the season-ending tournament 50 years ago, and with Spanish world number two Rafa Nadal finishing second in the London Group, they have avoided a semi-final clash. The 33-year-old Serb will face U.S. Open champion Dominic Thiem in Saturday’s semi-final, when Nadal plays Medvedev. Sunday’s final will end the tournament’s memorable 12-year stay in London before it re-locates to Turin. Djokovic was pummelled 6-3 6-3 by an inspired Medvedev on Wednesday, but was much sharper against Zverev, another one of the new generation trying to barge the old guard off stage. “In contrast to the match against Daniil I found the right shots at the right time,” he said. “I have tremendous respect for Sascha, a great player and not easy to return 140mph first serves. It was anybody’s game for most of the match.”