<P> The record for most runs scored by a team in a single inning is 18 , set by the Chicago White Stockings ( now the Cubs ) against the Detroit Wolverines on September 6 , 1883 . The modern - day record is 17 , achieved by the Boston Red Sox against the Detroit Tigers on June 18 , 1953 . </P>
most runs ever scored in a mlb inning
18