BOSTON--Former Red Sox slugger Tony Conigliaro was admitted to Massachusetts General Hospital Saturday morning after suffering a serious heart attack.

The hospital's emergency ward administrator. Harry F. Harding, said yesterday that Conigliaro has not regained consciousness since he was admitted. "He's stable but still serious," Harding added.

Conigliaro suffered the attack while being driven to Logan international Airport by his brother. Billy, also a former major league baseball player.

Conigliaro played major league ball for almost seven years with the Red Sox, beginning in 1964. The following year--at the age of 20--he hit 32 home runs, making him the youngest player ever to lead the American League in that category. By 22, he was the youngest player to rack up 100 round trippers.

Three weeks after that accomplishment, Conigliaro was struck in the head by a pitch from California Angel Jack Hamilton, resulting in a fractured left cheekbone, a dislocated jaw and a damaged left retina. After a year-and-a-half of rest, Conigliaro--Tony C. to his Red Sox fans--returned to baseball and was voted comeback player of the year."