Rick Miller, who wasn't scheduled to play, tripled with the bases filled in the eighth inning off relief ace Dan Quisenberry to highlight a six-run rally that broke a 2-2 tie and lifted the Boston Red Sox to an 8-4 victory over the slumping Kansas City Royals yesterday in Boston.

Dave Stapleton started the inning by singling off Quisenberry's foot. Stapleton went to third on a pinch single by Carl Yastrzemski, his first pinch hit in 12 tries this year.

Pinch hitter Rich Gedman grounded to the mound but Quisenberry threw wildly trying to get Stapleton at third. Miller hit a 3-2 pitch through the gap in right center to clear the bases. Jim Rice and Tony Perez added run-scoring singles to chase Quisenberry (4-4).

Reid Nichols was to start in center field for Boston but, minutes before the game, was advised that his wife had gone into labor. Nichols left for the hospital and Miller started.

The loss was the seventh in a row for Kansas City.

Mark Clear (7-4) relieved Bruce Hurst in the eighth inning and pitched out of mild trouble. He was relieved in the ninth by Tom Burgmeier after giving up two home runs.