MIAMI - Novak Djokovic tamed world number one Rafael Nadal 6-3 6-3 to claim his fourth Sony Open title on Sunday [url=http://www.usateamsoccershop.com/alejandro-bedoya-usa-jersey/]Alejandro Bedoya USA Jersey[/url] , denying the Spaniard a maiden win on the Miami hardcourts.

The win was the second straight Masters series title for the second ranked Serb, who defeated Roger Federer in the BNP Paribas Open two weeks ago in Indian Wells.

"That was a great confidence boost for me that I carried on in this week, and this tournament has been perfect from the beginning to the end," said Djokovic, after hoisting his 43rd career title.

"The matches that I have played I played really well, and I elevated my game as the tournament progressed.

"The best performance of the tournament came in the right moment on Sunday against the biggest rival."

The world's top ranked players added another line to what has grown into one of tennis's great rivalries with the Spaniard holding a 22-18 edge.

But the Miami title continues to be one of the few to elude Nadal, who has now finished runner-up four times at Crandon Park, twice beaten in the final by Djokovic.

"Miami is the same level as Indian Wells [url=http://www.usateamsoccershop.com/william-yarbrough-usa-jersey/]William Yarbrough USA Jersey[/url] , same level as Cincinnati, Toronto, Monte Carlo, Rome, Madrid," said Nadal when asked to explain his inability to hoist the Miami trophy. "The quality of the tournament is Masters 1000 that I won 26, so I cannot have a mental block on that.

"No, no frustration. That's tennis. That's the sport."

Both Nadal and Djokovic were well-rested after receiving walkovers into the final after opponents withdrew from the semifinals [url=http://www.usateamsoccershop.com/walker-zimmerman-usa-jersey/]Walker Zimmerman USA Jersey[/url] , giving the tournament a mouth-watering championship matchup.

The contest featured everything one would expect except from a matchup between the world's best with a title on the line, Nadal and Djokovic trading thundering groundstrokes right from the first point.

But on this day, a confident Djokovic, his game firing on all cylinders, kept Nadal on the defensive ending the drama quickly by winning all the big points.

"I played a few games and a few points with right way, with right intensity," said Nadal. "But for the rest, easy to analyse. The opponent was better than me. That's it.

"He was better than me in everything.

"I feel that I didn't move as well as I do normally. I feel that he was having too much success with every shot."

Both players had one break opportunity in an entertaining opening set and it was the Serb who made his count breaking Nadal to go up 4-2 and then holding serve for a 1-0 lead.

Djokovic quickly put his opponent under pressure [url=http://www.usateamsoccershop.com/ventura-alvarado-usa-jersey/]Ventura Alvarado USA Jersey[/url] , starting the second with a break and that was all he would need with Nadal unable to find a crack in the Serb's armor.

The match ended on another break and a dazzling rally, Djokovic sealing a clinical victory with textbook half-volley, then falling onto his back and punching his hands into the air in celebration.

"I didn't have any letdowns throughout the match," said Djokovic. I was in a very high level: serve, backhand, crosscourt, forehand. I mean, I have done everything right [url=http://www.usateamsoccershop.com/timothy-chandler-usa-jersey/]Timothy Chandler USA Jersey[/url] , and I'm thrilled with my performance.

"I did not want to lose focus for a second, because I knew that Rafa is a kind of a player that if you allow him, if you give him a chance, he's going to capitalize, he's going to get that chance, and he's going to come back to the match."

SYDNEY, Aug. 21 (Xinhua) -- Scientists from around the world have called for the United Nations (UN) to take action to stop the proliferation of "killer robots."

At the International Joint Conference on Artificial Intelligence in Melbourne on Monday, technology leaders from around the world congregated at the event [url=http://www.usateamsoccershop.com/tim-ream-usa-jersey/]Tim Ream USA Jersey[/url] , first held in 1969, and requested that the development of weaponry using artificial intelligence be halted as "once this Pandora's box is opened, it will be hard to close."

As part of this open letter to the UN, the scientists and business leaders, including world-renowned AI expert Toby Walsh, Elon Musk of Tesla, and James Chow of China's UBTECH, called for the use of lethal autonomous weapons [url=http://www.usateamsoccershop.com/tim-howard-usa-jersey/]Tim Howard USA Jersey[/url] , or killer robots, to be outlawed much in the same way as chemical and biological weapons on the battlefield.

"Once developed, they will permit armed conflict to be fought at a scale greater than ever, and at timescales faster than humans can comprehend. These can be weapons of terror, weapons that despots and terrorists use against innocent populations," the letter said.

Signed by many of the world's top AI minds, the letter was spearheaded by Walsh, a professor in AI at the University of New South Wales [url=http://www.usateamsoccershop.com/steve-birnbaum-usa-jersey/]Steve Birnbaum USA Jersey[/url] , who told Xinhua recently that he is concerned with what he feels is an "arms race" occurring around the world.

"I'm very worried about the impact that autonomy will have on the battlefields. There's an arms race happening today, you can see the U.S. military, the U.K. military, the Russian military -- it's a bit of an arms race," Walsh said.

"It would be a very dangerous, destabilized world we end up in if we do allow ourselves to fight war with these sorts of weapons."

Walsh and his cosignatories are asking the UN to step in and ban autonomous weapons, and he said that there has already been some positive movement from the UN in this regard, hoping this letter will spur even more actions.

"This is one where myself and thousands of my colleagues actually signed an open letter saying that the UN should take action [url=http://www.usateamsoccershop.com/sebastian-lletget-usa-jersey/]Sebastian Lletget USA Jersey[/url] , and the UN is starting slowly, but surely to take action in this space." Walsh said.

One of the biggest worries shared by these technology leaders is that a rogue state, or tyrannical regime, would be able to use this these weapons in order to suppress their populace into docility, and Walsh outlined the likely path he feels will be taken in such an eventuality.

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