At the 2011 US Open, Nadal made headlines when after defeating David Nalbandian in the fourth round, he collapsed in his post-match press conference because to severe cramps. He again lost in four sets to Novak Djokovic in the final. After the US Open, Nadal made the final of the Japan Open Tennis Championships. Nadal, who was the 2010 champion, was defeated by Andy Murray. At the Shanghai Masters, he was upset in the third round by No. 23 ranked Florian Mayer. At the 2011 ATP Finals, Nadal was defeated by Roger Federer and Jo-Wilfried Tsonga in the round-robin stage, and was subsequently eliminated from the tournament. In the Davis Cup final in December, he helped Spain win the title with victories over Juan Mónaco and Juan Martín del Potro.