It’s hard to win 100 games. From 1892 to 2016, a stretch spanning 125 seasons, just 99 teams reached the 100-win threshold, making it a relatively common occurrence but something that only happened once per year, if that.
Seasons that included two 100-win teams are rarer; there have been just 23 of these in MLB history. In 2017, though, there have been three 100-win teams, a truly amazing feat. When the Astros won their 100th game on Friday, this season became just the sixth in Major League history to include three 100-win teams.
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