Cardinals' Adam Wainwright stuns teammates, crowd by singing national anthem at final Opening Day

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The St. Louis Cardinals faithful had a surprise at Busch Stadium on Opening Day.

Adam Wainwright didn't get the start to begin his 19th MLB season (he's dealing with a groin injury), but he did give the performance of a lifetime – on the microphone.

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Adam Wainwright #50 of the St. Louis Cardinals delivers a pitch against the Milwaukee Brewers in the first inning at Busch Stadium on September 14, 2022 in St Louis, Missouri. (Dilip Vishwanat/Getty Images)

Yes, the three-time All-Star surprised everyone in attendance when he was called upon to sing the national anthem.

The public address announcer said an "up-and-coming singer" from St. Louis was taking the mic, and the crowd went nuts when they realized it was their beloved starter.

Wainwright had a chance to walk off into the sunset with Albert Pujols and Yadier Molina after last season, but he opted to stay for one more season – and why wouldn't he? He pitched to a 3.71 ERA in 32 starts last season.

Adam Wainwright #50 of the St. Louis Cardinals pitches against the Atlanta Braves in the first inning at Busch Stadium on August 28, 2022 in St Louis, Missouri. (Joe Puetz/Getty Images)

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Wainwright came up as a reliever and was the closer for the 2006 World Series championship team. The following season, he joined the rotation full time, and has given himself quite the resume.

The 41-year-old owns a career 3.38 ERA and was a finalist for the Cy Young Award in 2009, 2010, 2013 and 2014. He also finished in seventh place in 2021, his age-39 season.

A general view of Busch