Swiss tennis player Roger Federer is pictured at the Madang Road Station on metro Line 13 during the third day of Shanghai Rolex Masters in Shanghai, China, Oct 9, 2017. [Photo/IC]

Rodger Federer has surprised his fans in Shanghai by taking metro Line 13 to make his way to the ATP World Tour Event site, reports sina.com.

The tennis legend is now in China for the Shanghai Masters.

As part of his trip, Federer also had an impromptu dance-off with Mickey Mouse in a promotional event at Qizhong Stadium in Shanghai on Saturday.

The Swiss star also visited the Golden State Warrior's locker room ahead of their pre-season game against the Minnesota Timberwolves in Shanghai on Monday.

Talking with the Warriors about his pursuit of the number one spot in the ATP world rankings, Federer admitted that if he wanted to end the year as the world number one, he would have to win "here, and in the World Tour Finals and Paris and Basel" to have a chance of overtaking Rafael Nadal.

Nadal won his sixth title of the year after claiming the title at the China Open last week.

The Spaniard has 9875 points which puts him 2370 clear of Federer. There are 1000 points available for the winner in Shanghai.

Shanghai marks the first time Federer has competed since his US Open quarterfinal defeat to Juan Martin del Potro in September.