We are down to the Davis Cup Semifinals and fresh off his U.S. Open Finals defeat, Novak Djokovic will lead Team Serbia into action this weekend. Here is a look at the two semifinal competitions.

Serbia vs. Canada

With Novak Djokovic anchoring the Serbian team, it will be a tall task for the Canadians to break through in front of a hostile crowd on the red clay in Belgrade, Serbia. Pairing in singles with the current world number one is 23rd ranked Janko Tipsarevic. They will face 11th ranked Milos Raonic and Vasek Pospisil who is currently 41st in the World.

Djokovic will meet Pospisil first up followed by Raonic and Tipsarevic on Friday. Saturday will feature doubles between Bozoljac-Zimonjic and Dancevic-Nester. Canada's Daniel Nester is the 13th ranked doubles player in the World.

Sunday will see reverse Singles.

The key to the Canadians chances will need be Raonic. He will need to defeat Tipsarevic on the red clay on day one for Canada to have a legitimate shot at advancing. Tipsarevic has never defeated the Canadian on three tries but all three meetings were on the hard courts. Most recently, Raonic advanced in three sets at the Cincinnati Masters. A Raonic victory on the first day, paired with a doubles victory on Day 2 would give Canada a shot on Sunday even though they would be underdogs in both matches.

Serbia's only Davis Cup Championship was in 2010. They are fresh off of victories over Belgium and the USA.

Canada is looking for their first title. They have been in Davis Cup competition since 1913.

Argentina vs. Czech Republic

The defending Champion Czech's, once again enter a solid squad anchored by Tomas Berdych who is 5th in the world in Singles. Radek Stepanek is their second Singles participant. He is up first on Friday, meeting Juan Monaco.

Stepanek holds a 4-2 advantage against the clay court specialist. One of the two wins by the Argentine was on clay which will not be the case in this match up. The hard courts of Prague's O2 arena will be the venue and Stepanek has only dropped one set against Monaco all time on the indoor hard courts.

Berdych will meet Leonardo Mayer in the second Friday singles match. Mayer currently is the 93rd ranked singles player in the World. These two have never met but Mayer has only won one hard court match since clay court season ended.

On Saturday, Lukas Rosol-Jiri Vesely will meet Carolos Berlocq and Horacio Zeballos in doubles which could be a must win for the Argentines.

Sunday, Berdych and Monaco are scheduled to be first up. Berdych has never lost head to head holding a 7-0 edge. He has defeated the Argentine three times on the hard courts, one indoors.

Last up on Sunday is Stepanek against Mayer. This could be the most competitive of the matches with Mayer holding a 2-1 edge in all time head to head meetings. They have not faced each other since 2012.

Argentina is looking for their first Davis Cup title while the Czech Republic won in 1980 and 2012.