Before it evolved into interleague play, the Mets and Yankees engaged in the Mayor's Trophy Game. It was a series of exhibitions for charity. The games did not count in the standings. 

No big outings were made by Tom Seaver or Jerry Koosman, but then-understudy Nolan Ryan got a chance to show the fans what was to come in his Hall of Fame career ( (though not in a Mets uniform) when he and Jim McAndrew combined to no-hit the Yankees into the eighth inning. A year earlier, Ryan had been blasted in a 9-4 loss.  

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The Mayor's Trophy series started in 1963 at Yankee Stadium and had a bit of controversy as Mets manager Casey Stengel, in what was viewed at a slap at his former team, elected to go with his best pitcher, Carl Willey. The Mets won, 6-2. In later years, both teams would use the game to try out minor league pitchers.

The series went from 1963-79 and 1982-83. It ended with the Yankees holding a 10-8-1 advantage. The final game, played April 21, 1983 at Shea Stadium, was won by the Yankees. The hitting star was Willie Randolph, who would become the Mets manager nearly 25 years later.