Federer eases through
World number one Roger Federer defeated qualifier Lu Yen-hsun 6-3 7-5 to reach the third round of the Shanghai Masters.
A single break of serve in each set earned the Swiss victory over his opponent from Chinese Taipei in one hour 20 minutes.
Federer was dominant on serve, saving the single break point he faced, and capitalising on 64th-ranked Lu's second serve.
Novak Djokovic was an even more convincing winner as the Serbian second seed brushed aside Grigor Dimitrov 6-3 6-2 in less than an hour.
Djokovic took the Bulgarian's second serve apart, winning 82% of points on it, and did not offer him a look-in on his own serve.
The Serbian, who lost just five of points on serve, can return to the top of the rankings if he wins the tournament and Federer goes out before the quarter-finals.
He said on www.atpworldtour.com: "Very pleased with my serving in Beijing and obviously the first match today.
"So that's something that I've been working on, obviously. Relying on the serve in today's tennis is a big advantage.
"So I try to get as many free points as possible. Today that was the case. It helped me a lot to defeat my opponent."
Fourth-seeded Czech Tomas Berdych was also a straight-sets winner as he saw off Italy's Andreas Seppi 6-3 6-3.
France's Jo-Wilfried Tsonga, the fifth seed, was pushed harder before
overcoming compatriot Benoit Paire 7-6 (9/7) 7-5.
Janko Tipsarevic, seeded six, beat fellow Serbian Viktor Troicki 6-2 7-6
Swiss 13th seed Stanislas Wawrinka needed three sets to beat Denis Istomin of Uzbekistan 6-4 4-6 6-4.
Five seeds crashed out though, with Richard Gasquet, Gilles Simon, Milos
Raonic, Kei Nishikori and Philipp Kohlschreiber all seeing their hopes ended.
Ukraine's Alexandr Dolgopolov, Radek Stepanek, Marcos Baghdatis, Sam Querrey, Tommy Haas and Feliciano Lopez made it through to round three.