In the highest-scoring game in All-Star history, the American League beats the senior circuit, 13 – 8, in the thin air at Coors Field in Denver in the 69th All-Star Game. The 21-run total surpasses the previous record set in 1954 when the American League beat the Nationals, 11 – 9 in Cleveland’s Municipal Stadium. Baltimore’s Roberto Alomar is named the game’s MVP, going 3 for 4 with a home run, RBI, stolen base and two runs scored.

On July 7, 1998 In the highest-scoring game in All-Star history, the American League beats the senior circuit, 13 – 8, in the thin air at Coors Field in Denver in the 69th All-Star Game. The 21-run total surpasses the previous record set in 1954 when the American League beat the Nationals, 11 – 9 in Cleveland’s Municipal Stadium. Baltimore’s Roberto Alomar is named the game’s MVP, going 3 for 4 with a home run, RBI, stolen base and two runs scored.

Source:
Baseball Reference July 7