DOHA: Novak Djokovic took just 51 minutes to win his first game of 2016, easily beating Dustin Brown 6-2, 6-2 in the opening game of the Qatar Open on Monday.

The world No. 1 was rarely troubled by the German and barely raised a sweat in cruising into the second round with an ominous display for his rivals looking for any early-season weaknesses from Djokovic after his dominant 2015.

Djokovic said before the tournament started that he is in Doha to win and not merely play some warm-up matches before the defense of his Australian Open crown later this month.

And he certainly served notice of that, racing to a 5-0 lead in the first set in just 16 minutes.

Brown though rallied, holding his serve for the first time in the sixth game and then breaking the Serb’s serve to make it 5-2.

The world No. 118 then had two points to claim a third successive game but double-faulted twice, allowing Djokovic to claim the first set in just 25 minutes.

The second set followed a similar pattern as Djokovic, 28, swatted aside any potential resistance from Brown — who famously beat Rafael Nadal in the second round at Wimbledon last year — by breaking serve in the fourth game to take a 3-1 lead.

That was pretty much the end of Brown, a qualifier for the tournament, and the contest.

The 31-year-old rarely threatened the Serb’s serve and it ended in sorry fashion as Brown delivered his fourth double fault of the night to end the match.

It was the first ever meeting between the pair.

Djokovic, making his second appearance in Qatar, was watched on by coach Boris Becker, the first winner of the Qatar Open back in 1993.

Last year in Doha, Djokovic suffered a rare defeat, crashing out in the third round to Ivo Karlovic.

Nadal fed up of talking about subpar 2015 season

After a disappointing season last year, Rafael Nadal’s goal for 2016 is simple.

“The most important thing — play better,” the Spaniard said Monday, citing the physical and mental struggles he went through in 2015.

Nadal managed to recapture some confidence toward the end of the year, posting a 17-5 record following the US Open. The late push enabled him to finish the year ranked No. 5, keeping his top five season-ending ranking streak alive for an 11th year.

Nadal, winner of 14 Grand Slam championships, is getting fed up of being asked about his subpar 2015 that only delivered three minor titles. It was the first time in a decade he failed to win a Grand Slam title. His best results in majors last year were quarterfinal finishes at the Australian and French Opens.

“Seriously, I’m a little bit tired of talking every day about 2015,” Nadal said. “We are in 2016 already, no? We talked enough about 2015, and I talked enough about all the things that happened.”

“I have been very honest in all the press conferences without lying or without (not saying) the things that really happen to me,” he added.

Nadal is seeded No. 2 at the Qatar Open, where he was the champion in 2014. He opens the 2016 season on Tuesday with a match against fellow Spaniard Pablo Carreno Busta.

“I feel myself ready for the next season,” Nadal said. “The expectations are the normal ones, positive ones, because I feel that I finished the past season playing well and I feel that I am playing well again.”