Mrozinski came up through the Phillies\' organization, registering double figures in wins during each of his first four pro seasons. Recalled from Triple-A Syracuse in the middle of 1954, he got into 15 games for the Phils, four as a starter, and split two decisions with a 4.50 earned run average in 48 innings pitched. He threw one complete game; ironically, it was the game he lost, 5–2, on September 14 against the St. Louis Cardinals at Connie Mack Stadium. Mrozinski had held the Cards to two runs into the eighth inning before giving up back-to-back home runs to Red Schoendienst (a two-run job) and Rip Repulski. Ten days later, Mrozinski earned his only big-league win, going 6​2⁄3 innings against the eventual world champion New York Giants. In that game, Mrozinski left with a 4–2 lead, and was relieved by a Baseball Hall of Famer, Robin Roberts, who shut down the Giants for the remainder of the game to earn a save.\n', '

In 1955, he appeared in 22 games for Philadelphia, making only one start, and was winless in two decisions. He did, however, earn his only MLB save that year when he preserved a 10–8 victory over the Cardinals on June 21. The 1955 campaign was Mrozinski\'s only full year and his last season on a big-league roster. In his 37 games and 82​1⁄3 innings pitched, he allowed 87 hits and 44 bases on balls; he also struck out 44. Returning to the minors in 1957, he racked up four more years with double-digit victories, and won 119 games overall before retiring from the game.\n', '

Ron Mrozinski died at his home in Washington, New Jersey.\n', '

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