John James "Fats" Dantonio (December 31, 1918 – May 28, 1993) was a Major League Baseball catcher for the Brooklyn Dodgers in 1944 and 1945. "Fats" was 5 ft 8 in (1.73 m) tall and weighed only 165 pounds.

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Dantonio is one of many ballplayers who only appeared in the major leagues during World War II. He made his major league debut on September 18, 1944, in a road game against the Boston Braves at Braves Field.

He played in just 3 games in '44, then batted .250 in 47 games the next season. His career totals for 50 games include a .244 batting average (33-for-135), 12 runs batted in, 12 runs scored, a .301 on-base percentage, and a .304 slugging percentage. As a receiver he was well below average, making 14 errors in 182 total chances for a low fielding percentage of .923.

Dantonio died in his hometown of New Orleans, Louisiana, at the age of 74.

• Career statistics and player information from Baseball Reference, or Baseball Reference (Minors)
• Encyclopedia of Baseball Catchers
• Retrosheet

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