World's No 1 tennis player, Novak Djokovic, portrayed himself in his acting debut that took place in Bulgaria's capital Sofia.

The Serbian had a minor role in "Expendables 2", an action movie that stars the likes of Sylvester Stallone, Arnold Schwarzenegger, Bruce Willis, Jean-Claude van Damme and Chuck Norris, among others.

Nole arrived in Sofia late on Monday and was quick to try out the city's vibrant nightlife. The tennis star enjoyed a couple of drinks, visited a casino in downtown Sofia and even grabbed the microphone to perform some songs for his delighted fans, the Standart daily reports.

Djokovic was personally invited to join the cast of the sequel to "The Expendables" by Sylvester Stallone.

The shooting of "The Expendables 2" in Bulgaria will continue until Friday. Afterwards, the movie will be finished in China, where Jet Li will join the cast.