When and where: The Olympic men's semifinal between Novak Djokovic and Any Murray is scheduled to get underway at 11 a.m. ET. Coverage will be provided by Bravo, with a live stream available on NBCOlympics.com.

Preview: Novak Djokovic and Andy Murray renew what is becoming one of modern tennis' great rivalries when they meet in the semifinals of the Olympic Games on Friday. The pair will be meeting for the fourth time this year, with memories still fresh of a titanic tussle at the same stage of the Australian Open when Djokovic prevailed in five dramatic sets.

Murray comes into the contest looking to reach his second final at the All England Club in a matter of weeks having finished as runner-up to Roger Federer at Wimbledon just last month. With the passion created by competing for his country in the Olympics, the atmosphere promises to be even more fervent in his favor on Centre Court this time around.

A win for the British No.1 would secure his country's first men's singles medal at the Olympics in a century. While that weight of expectation would be overwhelming for some, Murray has become accustomed to it over the years at Wimbledon.

"It's great, that was the goal coming into the tournament," said Murray, of the potential to end Britain's medal drought in the event. "It's nice to get the opportunity. It makes a big difference to play in front of a home crowd. It does add a little bit of extra pressure, but it helps raise your game."

Born just a week apart, Murray and DJokovic have risen through the ranks together on the ATP Tour. Of late, though, it is the Serbian who has raised the bar in their rivalry.

After falling to Roger Federer in the semifinals at the All England Club last month and subsequently surrendering his world No.1 ranking, Djokovic will be eager to reassert himself at the top of the men's game. Of course, there is the added incentive of taking advantage of the rare opportunity to win Olympic gold, both for himself and his adoring nation.

Both men should be match tight after coming through some tough tests to reach this stage of the competition. In the quarterfinals, though, Djokovic and Murray looked to be close to the top of their games, as they progressed in straight sets. With the chance to fight for gold on the line, it promises to be another memorable match between the pair.

The rest of the day's semifinal action also provides some enticing matchups. Roger Federer and Juan Martin del Potro are currently on court in a tense third set of what has been a hugely engaging encounter.

The first women's contest has just gotten underway between Russian pair and good friends Maria Sharapova and Maria Kirilenko. Sharapova starts as favorite, but Kirilenko cannot be discounted after impressively dispatching of former Wimbledon champion Petra Kvitova in the last round.

The day's second semifinal promises much as well. In a repeat of the Wimbledon semifinal last month, Serena Williams goes up against world No.1 Victoria Azarenka. While the Belarusian has been a real force on the tour this year, she has so far failed to show that she can live with Williams at her best. An 8-1 losing record, including a demolition the last time the pair met, means that the battle may now be as much psychological as physical for Azarenka.