"Fancy" played a major role in introducing featured artist Charli XCX to the masses. She is now charting higher with her own "Boom Clap."

Update: Selling at very similar rates, Charli XCX’s “Boom Clap,” Iggy Azalea’s “Fancy (featuring Charli XCX)” and Nico and Vinz’ “Am I Wrong” are repeatedly shifting between the #6, #7 and #8 positions on iTunes. But as of press time, Charli XCX’s “Boom Clap” was indeed the fastest-seller of the three.

On the eve of what will likely be the song’s ascent into the Top 10 at pop radio, Charli XCX’s “Boom Clap” has charged past Iggy Azalea’s “Fancy (featuring Charli XCX)” on iTunes.

As of press time, “Boom Clap” was #6 on the iTunes overall single sales chart. Former #1 “Fancy,” which carved Charli XCX a firm position on the pop culture radar, is #7.

With “Fancy” on the unmistakable decline, both contributors have shifted focus to their new singles. Charli XCX is making major waves with the aforementioned “Boom Clap,” while lead artist Iggy Azalea seeks to reach the top of the chart with follow-up “Black Widow.” That song, which features Rita Ora, is currently #27 on iTunes.

Prior doing so with “Fancy,” Charli XCX reached the top ten on iTunes as a featured artist on Icona Pop’s “I Love It.” In addition to “Fancy,” Iggy Azalea is represented in the top ten as a featured artist on Ariana Grande’s #4 “Problem.”