Rafael Nadal of Spain reacts during the men's singles final against Gael Monfils of France in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)

Rafael Nadal of Spain poses with the trophy during the awarding ceremony after the men's singles final against Gael Monfils of France in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)

Rafael Nadal of Spain poses with the trophy during the awarding ceremony after the men's singles final against Gael Monfils of France in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)

Rafael Nadal of Spain celebrates for victory after the men's singles final against Gael Monfils of France in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)

Rafael Nadal of Spain returns the ball during the men's singles final against Gael Monfils of France in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)

Rafael Nadal (R) of Spain and Gael Monfils of France pose during the awarding ceremony after their men's singles final in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)

Rafael Nadal of Spain poses with the trophy during the awarding ceremony after the men's singles final against Gael Monfils of France in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)

Rafael Nadal of Spain greets the audience after the men's singles final against Gael Monfils of France in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)

Rafael Nadal of Spain celebrates for victory after the men's singles final against Gael Monfils of France in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)

Rafael Nadal of Spain poses with the trophy during the awarding ceremony after the men's singles final against Gael Monfils of France in Qatar Open tennis tournament, Jan. 4, 2014. Nadal won 2-1 to claim the champion. (Xinhua/Chen Shaojin)