FILE - In this June 27, 2014 file photo, Li Na of China plays a return to Barbora Zahlavova Strycova of the Czech Republic during their women's singles match at the All England Lawn Tennis Championships in Wimbledon, London. Li is pulling out of the U.S. Open because of a knee injury. Li says Thursday, July 31, 2014, in a posting on Facebook that she has "been struggling" with her knee since March "and it is just not where I need it to be in order to play at the highest level."(AP Photo/Pavel Golovkin, File)NEW YORK (AP) — Two-time major champion Li Na pulled out of the U.S. Open on Thursday because of a knee injury she said has bothered her for several months.

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