Novak Djokovic sweeps past Marin Cilic at World Tour Finals

Novak Djokovic swept past US Open champion Marin Cilic on a day of one-sided matches at the ATP World Tour Finals on Monday.

The world number one began his campaign for a third straight title at the O2 Arena with a 6-1 6-1 win in 56 minutes.
Djokovic joins Stan Wawrinka at the top of Group A after the Swiss earlier thrashed Tomas Berdych by the same score.
The two singles matches required a combined one hour and 54 minutes.
"It's been a great, great match," said Djokovic. "I haven't played here for 12 months, it's great to be back. It was a great performance.
"Marin, as a US Open winner, has a lot of confidence, but I managed to neutralise his serve and get a lot of balls back in play, and that was part of the tactic."
That Djokovic won the second match of the day was hardly a surprise, such is his dominance at the venue and over the opponent.
He is unbeaten at the O2 since 2011, has won his last 27 matches indoors and went into Monday's encounter with a 10-0 record against Cilic, who was making his ATP Finals debut.
The Croat had taken sets off Djokovic three times in 2014 and must have felt optimistic after the seven-time Grand Slam champion edged through a nervy first service game.
A little over half an hour later, Djokovic had reeled off seven straight games with his familiar combination of brilliant athleticism and precision hitting.
That Djokovic won the second match of the day was hardly a surprise, such is his dominance at the venue and over the opponent.
He is unbeaten at the O2 since 2011, has won his last 27 matches indoors and went into Monday's encounter with a 10-0 record against Cilic, who was making his ATP Finals debut.
The Croat had taken sets off Djokovic three times in 2014 and must have felt optimistic after the seven-time Grand Slam champion edged through a nervy first service game.
A little over half an hour later, Djokovic had reeled off seven straight games with his familiar combination of brilliant athleticism and precision hitting.