First baseman Bill Buckner, who has more than 2,500 major league hits and one unforgettable World Series error, was waived yesterday by the Boston Red Sox. The team was unable to trade the 37-year-old veteran and his big contract.

Boston called up International League homer and RBI leader Sam Horn, a 23-year-old designated hitter, from Pawtucket.

Had the Red Sox traded Buckner, his new team would have had to pick up his reported $800,000 salary this season. If he is not claimed in the 72-hour waiver period, he can make a deal with any club, which would have to pay him only the minimum salary of $62,500, prorated for the rest of the season. The Red Sox would be obligated to pay the difference between that and his contract amount.

Buckner, whose error allowed the New York Mets to score the winning run in the sixth game of last year's World Series, is batting .273 with two homers and 42 RBI in 75 games this year, his 18th in the major leagues . . .

The U.S. Pan American Games baseball team will play the Korean national team in an exhibition game Monday at 7:30 p.m. at Hagerstown (Md.) Municipal Stadium, home of the Class A Hagerstown Suns.