 Complete the following phrase:  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 