Andrew McKirahan, who also missed nearly all of this season's first half while serving a PED suspension, was the only member of the Braves bullpen on Thursday night who was on Atlanta's Opening Day roster. McKirahan likely would not have drawn that distinction had he not been a Rule 5 Draft pick in December.
Atlanta's bullpen includes two veterans -- Jason Frasor and David Aardsma -- who were acquired as free agents at different points within the past six weeks. But neither of them possess an overpowering repertoire like Vizcaino, whose plus fastball has averaged 96.3 mph this season.
Vizcaino has surrendered just one run and six hits in the nine innings he has completed since joining Atlanta's bullpen on July 6. The 24-year-old right-hander has recorded eight strikeouts and issued four unintentional walks, but not more than one in any of his 10 appearances.
As the Braves look toward next season, their closer candidates include Chris Withrow and Shae Simmons, who are both recovering from Tommy John surgery. But they will now take advantage of the opportunity to see how Vizcaino handles the role.
Mark Bowman is a reporter for MLB.com. Listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.