ST. LOUIS - The Luke Bryan concert at the Hollywood Casino Amphitheatre had a surprise performer on Sunday night .
St. Louis Cardinals legend Adam Wainwright joined Luke Bryan on stage to sing a song called "I Like Coming Back."
Adam Wainwright is heard in the video saying he had recently talked to Luke Bryan on the phone and asked if he could play a song at his concert in St. Louis.
The crowd seemed to love hearing Wainwright sing.
Since retiring last year, the former Cardinals pitcher has been focusing on his music career. The former Cardinals pitcher dropped his debut album, "Hey Y'all," in April.