Dennis Eckersley had one of the most illustrious careers in MLB history.
A first-ballot Hall of Famer, Eck spent his first 12 seasons as a starting pitcher before becoming the game's most feared closer. The former A's great finished with 390 saves, seventh most in MLB history, and is one of just two pitchers ever to record a 20-win season and a 50-save season.
Yet as dominant as Eckersley was, he believes current A's closer Blake Treinen might be even better.
"If I was playing nowadays, I'd probably be setting up for this guy," Eckersley told NBC Sports California.