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Photos: Roger Federer warms up for U.S. Open semifinal

The RF, and the Nike, in full force on the practice court at the U.S. Open on Sept. 6, 2014

NEW YORK – The RF was on the pocket. The Nike – in massive type, in case you missed it – was on the shorts.

And the fans were on hand, including Federer's father Robbie, to watch the No. 2 seed get ready for his U.S. Open singles semi-final against Marin Cilic.

Here's what it looked like.