The Yankees lose a doubleheader to Washington and fall to 3rd place in the American League, a half game behind the Orioles and White Sox. P Camilo Pascual’s grand slam is the difference in a 5 – 4 first-game win. In the second game, Mickey Mantle, believing there are two outs, jogs to first base on a grounder to third. The Senators turn a double play, with New York’s Roger Maris suffering bruised ribs trying to break it up at second base. Maris will miss 18 games as a result. Mantle is heavily booed, and manager Casey Stengel replaces him with Bob Cerv. The clubs set a major-league record by using 17 pinch hitters – 9 by the Yankees – in the doubleheader (more than 18 innings), while playing a major-league record 24 errorless innings.