Updated at 11:16 p.m. on Saturday, June 9, 2018.

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Luke Combs

UPDATE: Riverbend organizers have announced Brett Young as the replacement act for Sunday's 9:30 p.m. show, according to a news release.

Young currently has three #1 hits and is the reigning ACM New Male Vocalist of the Year. Riverbend Festival fans flooded the Bud Light Stage in 2017 to see Young perform.

Justin Cole of Entercom Chattanooga and US101 says Young is "one of the strongest vocalists in country music and it will be a show to remember."

All tickets purchased for Starview Landing, reserved Star Seats and Fan Stands for the Luke Combs performance are good for the night of the 10th with Brett Young, according to the release.

Friends of the Festival will also offer, for any Starview Landing, Star seating, or Fan Stands ticket for June 10th, 50% off Starview Landing for the Dustin Lynch performance on June 13th. The offer is good for purchase on Sunday only. Buyers will need to purchase those Dustin Lynch upgrades at the Starview Landing entrance Sunday, June 10.

If patrons wish to have their money refunded for Starview Landing, Star Seating or Fan Stands for June 10, they should send an email to making a request. Proof of purchase is also required.

ORIGINAL STORY: Riverbend is currently without a headlining act for Sunday's show. 

Country artist Luke Combs canceled his scheduled performance after the performer lost his voice. The artist known for hits such as "Hurricane," "When It Rains It Pours" and "One Number Away" was scheduled to be the headliner on the Coke Stage Sunday evening. 

"I'm devastated over this, but unfortunately, I'm not going to be able to play for y'all this weekend or next because I've lost my voice," Combs tweeted. "... I've powered through plenty of shows before, but with how my voice sounds and feels today I couldn't possibly give y'all the show you paid for and deserve."

Combs lost his voice last night during the CMA Fest in Nashville, Tennessee, he tweeted. After speaking with doctors, the Asheville, N.C.-native announced he would take 10 days to rest. Combs released his debut album This One's For You in 2017. The album was named one of the best country albums of 2017 by Rolling Stone and opened at no. 1 on the Billboard Country Albums chart and has remained inside the top 10 on the same chart since its release.

Riverbend officials are currently working to find a replacement. 

"We are as disappointed as our Riverbend Festival fans to hear that Luke Combs has lost his voice and won't be able to perform Sunday night," festival spokeswoman Amy Morrow wrote in an email. "The apparent love the Tennessee Valley has for him is quite evident and we wish him a sound and swift recovery. We are now working fast and furiously on a replacement."