Andy Murray of Britain reacts
Andy Murray of Britain reacts after defeating Jo-Wilfried Tsonga of France during their match at the 2014 U.S. Open tennis tournament in New York, September 1, 2014. Reuters

The British no. 1 Andy Murray dropped out of the world top 10 ranking for the first time since 2008 and he might miss the ATP World Tour Finals at the O2 Area in London.

Murray's defeat to Marin Cilic at the U.S. Open has pushed him down to the world no. 11 ranking that means that his place in the upcoming popular London tournament on Nov. 9 to 16 might be compromised.

The 27-year-old's lost to world no. 1 Novak Djokovic in the quarter-finals at the U.S. Open gave him ample points to compete to the World Tour Finals -- a tournament that features the world top 8 players.

Currently, Tomas Berdych occupies the final spot, but Murray needs to defeat Milos Raonic and Grigor Dimitrov, who were both within 400 points of each other to make it to the tournament.

Thus far, Murray has three events on queue until Nov. and to be able to qualify for the World Tour Finals, he needs to reach the finals at either Paris or Shanghai Masters.

Back in Sept. 2013, Murray ranked as high as world no. 3, but he suffered with loss of form due to a back surgery and since then, winning against Jo-Wolfried Tsonga during the U.S. Open was the only time he was able to defeat a world no. 10 player. Furthermore, he was beaten at the French Open and he only got to the quarter-finals at the Wimbledon and Australian Open.

Meanwhile, the Scot tennis superstar received wildcard entry to the China Open this month. Although, he did not play any Beijing event since 2010, it appears that Murray is trying to accumulate as much points as he can to qualify for the World Tour Finals in London.