Djokovic cruises past Isner in ATP Finals opener

LONDON — The opening matches at the ATP Finals led to a debate over whether conditions at the O2 Arena were trickier than in past years. Novak Djokovic ended it. The Wimbledon and U.S. Open champion made an impressive start to his campaign for a sixth title by dismissing John Isner 6-4, 6-3 on Monday. Roger Federer, who lost on Sunday, and Alexander Zverev described conditions as challenging following their error-strewn opening matches at the season-ending tournament, but Djokovic dropped just six points on his serve and made six unforced errors. “My results here have been pretty good in the last 10 years, so I can’t complain too much,” said Djokovic.