Novak Djokovic says elbow has healed, looking to return to competition

Tennis BNP Paribas Open Day 10

It was a much-needed confidence boost for the world number two after enduring the toughest period of his career since winning the French Open past year.

Serbia eased into the semi-finals of the Davis Cup after taking an unassailable 3-0 lead over Spain after Saturday's doubles win. "I like playing for my country".

Serbian Davis Cup team player Novak Djokovic speaks during a press conference after the draw for the tennis Davis Cup quarterfinal match in Belgrade, Serbia, Thursday, April 6, 2017.

World number two Novak Djokovic made a winning return to action in Serbia's clash with Spain in Belgrade, having withdrawn from the Miami Open with a right elbow injury.

"We must not underestimate them", Djokovic said.

Serbia, champion in 2010, is on the verge of advancing to the semi-finals after Viktor Troicki saw off Pablo Carreno Busta 6-3 6-4 6-3 in the second rubber.

With the elbow now healed, Djokovic said earlier this week at Davis Cup that he enjoyed the time off to spend with his wife and family.

Pouille gave hosts France a winning start in the quarter-final with a 7-5, 7-6 (8/6), 6-3 victory over Kyle Edmund.

Although Djokovic is still number two in the world the 29-year-old remains a shadow of the man whose maiden Roland Garros title in June last year allowed him to boast ownership of all four majors.

Australia is also firmly on course to advance from its tie with United States courtesy of wins from Jordan Thompson and Nick Kyrgios in Brisbane.

"We've got a big tie against USA".

The US head to Australia with world number 15 Jack Sock in their squad along with John Isner.

On a ideal day for all four of the quarter-final hosts, Australia were 2-0 up on the United States in Brisbane, closing in on a semi-final date against Belgium who were 2-0 ahead of Italy in Charleroi.

"I'm still very emotional out there".

Belgium, runners-up in 2015 to Great Britain, are seeking their second semi-final appearance in three years, while the Italians are bidding for their first since 2014.