One of the other two teams was the 1914 Boston Braves. They were 20-30 in the first 50 games.
What is even more amazing is that on July 18th of that year, they were 35-43, and in last place in the National League (8 teams in each league in those days).
This was the latest date that a team has been in last place, only to come back and win a pennant. (At least before divisions should up in baseball).
The Braves, after July 18th went 59-16, and swept the heavily favored Philadelphia A's in the World Series in four straight games.
Hence their nickname.....the Miracle Braves.
No idea who the fourth team was.