Novak Djokovic has beaten Alexander Zverev in the ATP Finals to earn his second straight win at The O2 Arena, in London, on November 14th.
The 31-year-old Serbian was able to overcome illness to beat his German counterpart 6-4, 6-1 in a game that lasted for just over an hour and 15 minutes.
As reported by AP, Djokovic said, "Unfortunately today hasn't been great in terms of that (illness)… Somehow I managed to gather the strength when I needed it."
The back-to-back victories have taken Djokovic a step closer to the semi-finals stage, while Zverev is going to need a win against John Isner for a chance to qualify to the last-four.
Zverev – ranked third in the tournament – attempted to stay in the game during the first set as he pulled off a great defensive display at 5-4. However, Djokovic summoned his considerable resources to stop the 21-year-old from taking the lead.
AP added that Djokovic broke for a 3-1 lead before going on to ensure that all of the seven matches in the tournament have ended with straight sets wins.
"I guess winning the first set really counts this year," Djokovic said. "Then, I guess, you have mentally quite an edge."
The reigning Wimbledon and US Grand Slam champion is set to take on John Isner of the United States on November 12th.