The Houston Astros won their 100th game of the season last night making them the third team to win 100 games in 2017 (the Dodgers and Indians have also won 100 games).
This is the sixth time in MLB history that three teams have won 100 games in the same season. It was also done in 1942, 1977, 1998, 2002 and 2003.
Of the five previous times when three teams won 100 games in the same season, one of those 100-win teams won the World Series that year in 1942 (Cardinals), 1977 (Yankees) and 1998 (Yankees). None of the three 100-win teams made the World Series in 2002, and the Yankees were the only 100-win to make the World Series in 2003… they lost to the Florida Marlins that year in the World Series.
Only once in the five years noted above, 1942, did two of the 100-win teams reach the World Series and faced off against each other for the championship: That happened in 1942 when the Cards beat the Yankees.