Taylor Swift performs on stage during day two of Capital's Jingle Bell Ball with Coca-Cola at London's O2 Arena.

"With 11 days left before the show, Swift has already surpassed [One Direction's] attendance number," Tom Sadler, president and CEO of the Arizona Sports and Tourism Authority, tells Billboard.

Taylor Swift's Reputation tour starts next month in Phoenix, and the "End Game" singer has already broken a record, a week before her first concert.

Swift's first show at the University of Phoenix Stadium in Glendale, Arizona, on May 8 will surpass One Direction's visit in 2014, which drew 56,524 fans.

While exact attendance and ticket sales information won't be available until after the show, Tom Sadler, president and CEO of the Arizona Sports and Tourism Authority, confirmed to Billboard that the "Delicate" singer's May 8 show would be a record-breaker.

"The frenzy continues to grow as Taylor Swift has already broken the University of Phoenix Stadium's concert attendance record, which was previously held by One Direction in 2014 with 56,524 fans," he tells Billboard. "With 11 days left before the show, Swift has already surpassed [One Direction's] attendance number."

Swift will be joined at the show by opening acts Camila Cabello and Charli XCX for the Reputation tour, which heads to Santa Clara, California (May 11-12), after the Arizona opener before heading south to the Rose Bowl in Pasadena (May 18-19).

Visit TaylorSwift.com for ticket information and a complete list of shows.