Charles Oscar Hartenstein (born May 26, 1942) is an American former professional baseball relief pitcher. He played in Major League Baseball (MLB) for five different teams between the 1966 and 1977 seasons. Listed at 5 ft 11 in (1.80 m), 165 lb (75 kg), Hartenstein batted and threw right-handed. He was signed by the Chicago Cubs in 1964 out of the University of Texas at Austin.\n', '

A Texas Longhorns star pitcher, Hartenstein led his team to the 1962 and 1963 CWS tournaments. After being signed by Chicago, he led the Texas League with a 2.19 ERA in 1965 while pitching for the Dallas–Fort Worth Spurs. On June 17, 1965 Hartenstein had one of the most impressive pitching feats in Texas League history, in a game against the Austin Braves as the starter. The Spurs had a 1–0 lead going into the ninth inning when he gave up a tying run. The game continued that way with Hartenstein pitching 18 innings. He allowed one run, eight hits, walked four and struck out seven. The game continued through the 25th inning with Austin winning 2–1. At the time it was the longest game in Texas League history.\n', '

Hartenstein entered the majors in 1965 with the Cubs, appearing in one game as a pinch runner. He played for them until 1968, before joining the Pittsburgh Pirates (1969–70), St. Louis Cardinals (1970), Boston Red Sox (1970) and Toronto Blue Jays (1977). His most productive season came in 1967 for Chicago, when he went 9–5 with a 3.08 ERA and 10 saves, all career-numbers. He also enjoyed a solid season with the 1969 Pirates, going 5–4 with a 3.85 ERA and 10 saves in a career-high 95​2⁄3 innings pitched. After six years of absence, he pitched his last major season with the 1977 expansion Blue Jays.\n', '

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