It's called the U.S. Open, and the crowd is definitely from New York, but the clothing on the court is decidedly Japanese.

Stan Wawrinka, wearing Yonex, thrilled fans with a four-set victory over world No. 1 Novak Djokovic, sponsored by Uniqlo. The semifinals featured another Uniqlo athlete, Kei Nishikori, and Gael Monfils, who is backed by Asics.

As the 2016 Grand Slam draws to a close, Japanese brands have far outpaced their Western competition. Led by Djokovic and Uniqlo, Japan's apparel makers have turned up in seven men's Grand Slam semifinals this year — more than Nike, Adidas and New Balance combined.