Major League Baseball's 2025 postseason will proceed on Sunday with the start of the league championship round. The American League's matchup will pit the Seattle Mariners against the Toronto Blue Jays and will get underway tonight. Over in the National League, which will start on Monday, the Los Angeles Dodgers will take on the Milwaukee Brewers.

The respective winners will advance to face each other in the 2025 World Series.

As is tradition, CBS Sports brings in the start of every new playoff round by highlighting a plausible X-factor in each series that could make the difference. There is no real definition of an "X-factor" beyond it being whatever could play a role in the proceedings. Sometimes, that's a piece of insight gleaned from granular analysis; other times, it's almost

See Full Page