THERE’ll be a Jem of a show to night at Rockefeller Center.

The Welsh electronica pop-rocker takes the stage at 6 p.m. for a free live outdoor performance, as part of American Express’ week-long celebration of the U.S. Open.

If you miss the show, tune in to the USA Network’s “Primetime at the Open” at 7 p.m., for a broadcast of Jem’s performance.

American Express’ “U.S. Open Live at Rockefeller Center” event continues through Sunday – tennis fans can catch live broadcasts of matches from 11 a.m. to 11 p.m. on a giant screen, while enjoying various concessions, a tennis court and other free interactive activities.

For more information, check out americanexpress.com/usopen.