LONDON – Novak Djokovic overcame an early break to beat Diego Schwartzman 6-3, 6-2 Monday at the season-ending ATP Finals in an empty O2 Arena.The top-ranked Djokovic has won the tournament five times — one short of Roger Federer's record.Schwartzman broke Djokovic for a 2-1 lead in the first set, but the 28-year-old Argentine immediately gave it back as he struggled with his first serve.At 3-3, Djokovic won five straight games to close out first set and build 2-0 lead in second.Djokovic hasn’t lost an opening ATP Finals match since 2007 against David Ferrer.
The 33-year-old Serb has never lost to Schwartzman in six matches.The Argentine player — without a title this year and making his debut at the ATP Finals — reached the French Open.