French Open: Day 9

China's Li Na celebrates match point after her 2-6, 6-1, 6-3 victory over Petra Kvitova of the Czech Republic.

Petra Kvitova stretches to returns the ball to Li Na during their fourth-round match.

Bob Bryan and Mike Bryan of the United States celebrate match point after defeating Russia's Teymuraz Gabashvili and Kazakhstan's Mikhail Kukushkin in men's doubles.

Andy Murray of Great Britain checks on his injured ankle before facing Serbia's Viktor Troicki.

Juan Ignacio Chela of Argentina falls to the court as he celebrates match point of a 4-6, 6-2, 1-6, 7-5(5), 6-2 victory over Alejandro Falla of Colombia.

A stadium employee measures the height of the net during a break in the Juan Ignacio Chela-Alejandro Falla match.

Rafael Nadal of Spain plays a forehand during his 7-5, 6-3, 6-3 victory over Croatia's Ivan Ljubicic.

Ivan Ljubicic returns to Rafael Nadal during their fourth-round match.

Rafael Nadal changes his shirt during Monday's match with Ivan Ljubicic.

France's Gael Monfils reacts as he plays Spain's David Ferrer during their fourth-round match. Monfils won 6-4, 2-6, 1-6, 7-6(5), 6-2.

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