December 12, 1941 – Future Hall of Famer Arky Vaughan is traded by the Pittsburgh Pirates to the Brooklyn Dodgers. The Bucs receive four players in return, catcher “Hot Potato” Hamlin, Pete Coscarart, Babe Phelps and Jimmy Wasdell.

Shifted to third base by the Dodgers, Vaughan had an off year in 1942, batting just .277, to finish under .300 for the first time in his career.  However, he rebounded in 1943, batting .305 and leading the National League with 112 runs scored and a career-high 20 stolen bases.

December 12, 1954 – Willie Mays and Roberto Clemente lead the North to victory in the Puerto Rican Winter League’s annual All-Star fundraiser. The Sporting News correspondent, Pita Alvarez De La Vega, gives the exuberant young duo’s exploits some national exposure: “The league took a break from its pennant battle to stage the annual ‘Three Kings’ all-star game at Mayaguez. All proceeds went into a YMCA fund to buy gifts for the island’s poor children in keeping with the old Latin tradition of the Three Kings bringing gifts on January 6… The All-Star North team, made up of players from the Santurce and Mayaguez clubs, won the game, 7 to 5. Willie Mays and Roberto Clemente hit home runs for the winners.”

December 12, 1969 — Cleveland trades pitchers Luis Tiant and Stan Williams to the Twins for 3B Graig Nettles, OF Ted Uhlaender, and pitchers Dean Chance and Bob Miller.

Tiant posted a 9-20 record with a 3.71 ERA in 1969. However, his strikeout-to-walk ratio completely tanked, leading to suspicions that he was pitching hurt. He pitched very well at the start of the 1970 season. Tiant was 6-0 with a 3.12 ERA by the end of May, which was followed by him going on the disabled list with arm troubles. He came back in early August, but only won one more game the rest of the way, and then gave up a run in two-thirds of an inning in a relief appearance when...