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6. Dec. 4, 1968: The Orioles get pitcher Mike Cuellar and shortstop Enzo Hernandez from the Houston Astros for outfielder Curt Blefary.

A 31-year-old junkball pitcher with two winning seasons behind him, Cuellar (pictured, left) is thought to be washed up when dealt to the Orioles. Instead, he becomes a workhorse, winning 20 or more games four times, earning a Cy Young Award and carrying the team to three AL pennants. A crafty...

Walter McCardell, Baltimore Sun