Born. To Margaret Trudeau, 27, and Pierre Elliott Trudeau, 55, Prime Minister of Canada: their third child, third son; in Ottawa.

Married. Boris Spassky, 38, former international chess champion; and Marina Stcherbatcheff, 30, a secretary at the French embassy in Moscow; he for the third time, she for the first; in Moscow. When Spassky first announced his intention to marry the pretty French-born daughter of Russian emigres, Soviet bureaucracy said she would have to leave the Soviet Union by Sept. 30. Anxious to avoid an international scandal on the eve of French President Valery Giscard d'Estaing's October visit to the U.S.S.R., Russian authorities relented. Said Spassky: "Now I have an extra queen in my competitions."

Died. Guy Mollet, 69, Socialist Premier of France from January 1956 to June 1957; following a heart attack; in Paris. In 1956, Mollet collaborated with Britain's Prime Minister Anthony Eden in the British-French attack on the Suez Canal in coordination with an Israeli invasion of the Sinai from the east.

Died. Joan Whitney Payson, 72, jolly, spirited centimillionaire and lifelong sports fanatic who owned racing stables and, since its inception, the New York Mets baseball team; following hospitalization for a stroke; in Manhattan.

Died. Leland Stanford ("Larry") MacPhail, 85, former New York Yankee president and sportsworld impresario; of pneumonia; in Miami, Fla.

Until 1935 baseball remained an afternoon pastime; then MacPhail flooded Cincinnati's Crosley Field with banks of lights and gave a new dimension to the game. With his indomitable optimism he bailed clubs out of hock and transformed cellar teams into pennant winners: the Cincinnati Reds, the Brooklyn Dodgers and the Yankees. Off the diamond, MacPhail put his improbable imagination to work in the practice of law, managing a department store, as a banker, a football referee, a church organist and a breeder of thoroughbred horses. As an artillery captain following the Armistice of World War I, he persuaded seven fellow officers to help him try to kidnap the German Kaiser Wilhelm and deliver him as a Christmas present to President Woodrow Wilson. The scheme eventually failed, but the fact that MacPhail managed to nab one of the Kaiser's monogrammed ashtrays testified to how close the plotters had come to pulling it off.

Died. Baseball's Casey Stengel, 85, garrulous sage and part-time genius (see SPORT).

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