The most runs scored by a single team in the first inning is 16 by the Boston Beaneaters against the Baltimore Orioles in 1894. The most runs scored by both teams in the first inning is 16 held by Boston and Baltimore as described above (Boston 16, Baltimore 0) and the Oakland Athletics and California Angels in a game in 1996 where Oakland scored 13 runs and California scored 3 runs.
I believe it's 14. They scored 14 runs in the first inning against houston. I believe in 1989?
16 by the Boston beaneaters In 1894
The most runs scored in an inning by both teams is 19 in the 8th inning of a game between Cleveland and Boston in 1977. Cleveland scored 13 runs and Boston scored 6. The most runs scored by a single team in aninning is 18 by Chicago against Detroit in the 7th inning of a game played in 1883.
That was the 1st and the 4th where 8 runs combined were scored in each inning.
the most runs scored in an inning before the first out was 12 set in 1953 by the Brooklyn dodgers in the 8th inning the red sox scored 12 the other night in the sixth on may 8 2009 tieing a modern day record
In MLB history, the most runs scored by a single team in the ninth inning is 14 by the Baltimore Orioles against the Boston Beaneaters in 1894. The most runs scored by both teams in the ninth inning is 17 by the New York Giants and Boston Braves in 1912. The Giants scored 7 runs and the Braves scored 10 runs.
The Cleveland Indians scored 14 runs in the top of the 2nd inning on April 18, 2009.
They scored 8 in the 2nd inning of some game. My source doesn't give the date, but that is the most they've scored in an inning this year.