Novak Djokovic extended his winning streak to 13 straight matches with a swift 6-2, 6-1 win over Martin Klizan in the second round of the Shanghai Masters on Wednesday.<br />Rafael Nadal also advanced to the third round, although in far more difficult fashion.<br />The eighth-seeded Spanish player escaped with a 7-5, 6-7 , 7-6 win over Ivo Karlovic of Croatia in two hours, 43 minutes.<br />Djokovic is coming off his sixth China Open title last week, where he only lost 18 games in the entire tournament - the most dominant title run of his career.<br />He picked up right where he left off in Shanghai, fending off the only break point he faced against Klizan to win in 63 minutes.<br />Djokovic is aiming for his ninth title of the year and his third at the Shanghai Masters.<br />"Considering the fact that I've won so many matches this year and tournaments, probably the best season of my life definitely, anywhere I go I'm confident," he said.
