July 2006: A baseball rarity

Baseball note: Back in July 2006, the ChiSox played a series against Boston.
It was a regular season series between the last 2 WS Champs.
Frankly, I can't think of any other examples of the last two World Series champions playing each other in a regular season series.

— Silvio Canto, Jr. (@SCantojr) January 29, 2018