LONDON (Reuters) - Roger Federer may not be the overwhelming favorite to win Wimbledon for a seventh time but the Swiss world number three is still peerless when it comes to raking in endorsements.

The Swiss maestro features in seven of the 20 most-shared tennis advertisements drawn up by Unruly Media, which calls itself "a global platform for social video advertising."

Some doubted the shot's authenticity and a coy Federer stonewalled all queries, insisting a magician never reveals his tricks.

Maria Sharapova, Li Na and Ana Ivanovic also make it on to the male-dominated list which has Serbian showman Novak Djokovic making a couple of appearances, playing tennis on wings of a flying plane on one occasion.

Briton Andy Murray also features in two commercials that make the top 20 list.

(Reporting by Amlan Chakraborty in New Delhi; edited by Alastair Himmer)