Frank Thomas Duffy (born October 14, 1946) is an American former professional baseball player.

On May 29, 1971, Duffy was traded along with pitcher Vern Geishert for young outfielder George Foster.

[2] Perry went on to win 20 games three times, receive two Cy Young Awards, and eventually earn a place in the Hall of Fame, while McDowell pitched for four seasons, winning 10 games in 1972 but only 9 in the next three seasons combined.

[3] He became expendable after his unexpected re-signing just before the start of spring training created a glut of shortstops for the Indians who had acquired Tom Veryzer and Dave Rosello during the off-season.

[4] His time in Boston was most noted for his quote "The team gets off a plane and twenty-five players go off in twenty-five different cabs," an indictment of his teammates' egocentric discord that resulted in their inability to cope with adversity during the Red Sox's 1978 American League East pennant race collapse.