Costas is a devoted baseball fan. He's been suggested as a potential commissioner and wrote Fair Ball: A Fan's Case for Baseball in 2000 . For his 40th birthday, then Oakland Athletics manager Tony La Russa allowed Costas to manage the club during a spring training game. The first time Costas visited baseball legend Stan Musial 's St. Louis eatery, he left a $ tip on a ten dollar tab in homage to Musial's lifetime batting average (.331). Costas delivered the eulogy at Mickey Mantle 's funeral . In eulogizing Mantle, Costas described the baseball legend as "a fragile hero to whom we had an emotional attachment so strong and lasting that it defied logic". Costas has even carried a 1958 Mickey Mantle baseball card in his wallet. Costas also delivered the eulogy for Musial after his death in early 2013.