St. Louis Cardinals manager Oliver Marmol believes in the “no shirt, no problem,” mantra. His club was boosted to a win Friday night by a group of college ball players in the right-field seats who took off and waved their shirts as they sang, chanted and drew others into the fray.

St. Louis Cardinals manager Oliver Marmol believes in the “no shirt, no problem,” mantra. His club was boosted to a win Friday night by a group of college ball players in the…

Who were those shirtless fans? And how did a trend, one that Cardinals manager Oliver Marmol has since backed, start at Busch Stadium?

The St. Louis manager made a plea on social media for more shirtless fans after his team's walk-off win over Kansas City at Busch Stadium.