Upon his discharge four years later, he first saw service with the Brooklyn Dodgers. Possessing a "rubber arm", Hatten worked as both a starting pitcher and a reliever, even appearing in both ends of a double-header.[2]
Hatten's first year in the big leagues in 1946 saw him post a 14–11 won-lost record with a 2.84 ERA, eighth-best in the National League. He followed that season with a career-high 17 wins, eight losses and a 3.63 ERA. Hatten often had trouble controlling his pitches, as he allowed the second-most bases on balls in each of his first two seasons with the Dodgers, walking 110 batters in 1946 and 105 in 1947. He also led the National League in hit batsmen with seven in 1946. In 1948, Hatten threw 51 pitches in a five-inning complete game shutout against Cincinnati, the fewest pitches for a complete game in major league history.[3]
The Dodgers won the 1947 and 1949 NL pennants during Hatten's stay, and he would appear in six World Series games, all against the New York Yankees. In 1947, he started Game 3 at Ebbets Field. Staked to a 6–0 lead after two innings and a 9–4 advantage after four, Hatten was driven from the contest with one out in the fifth after allowing a two-run home run to Joe DiMaggio. Brooklyn held on to win, 9–8, but the victory was awarded to relief ace Hugh Casey.[4]
His other five Fall Classic appearances would come in relief, three in 1947 and two in 1949. Over Hatten's six games pitched, he did not earn a decision or a save; in 102⁄3 total innings, he allowed ten earned runs on 16 hits and nine bases on balls, striking out five. His career World Series earned run average was 8.44.
Chicago Cubs
Hatten won 59 games (losing 39) for the Dodgers between 1946 and June 1951, when he was sent to the Chicago Cubs as part of a blockbuster mid-season trade that delivered slugging outfielderAndy Pafko to Brooklyn. He finished his MLB career by going 6–10 for the Cubs through July 1952.
MLB statistics
During his 233-game MLB career, Hatten compiled a record of 65–49 with a 3.87 ERA. He registered 51 complete games and eight shutouts in 149 career starts, and four saves in 84 relief assignments. In 1,087 innings pitched, he allowed 1,124 hits and 492 walks, with 381 strikeouts. Hatten pitched in the high minors into 1960, and was 43 years old when he retired from the mound.