 Mazzaro's first start was on May 11 versus the New York Yankees.Mazzaro's stay with the Royals was a short-lived one.Following his second appearance on May 16, in which he allowed 14 earned runs in 2⅓ innings of relief, a team record for runs given up by one pitcher in a game, and the worst performance of a pitcher in the Major Leagues since the first half of the 20th century,– Mazzaro was optioned to Omaha, and left-hand relief pitcher Everett Teaford was called up to replace him.