We’re in the final month of the season, and the margin for error among teams on the fringe of the playoff races has been reduced to almost zero.

This week features numerous series between contenders and several teams facing challenges from two postseason hopefuls. The Reds play the Blue Jays and Mets; the Yankees play the Blue Jays and Astros; the Astros play the Yankees and Rangers; the Blue Jays meet the Reds and Yankees.

In a week, we’ll know a lot more about where those teams fit into the playoff picture . For now, let’s look at five of the many series to watch this week and how they could reshape two pennant races.

Phillies at Brewers: 3 games (Monday, Wednesday-Thursday)

Head-to-head: Milwaukee swept the Phillies in a three-game series in Philadelphia in late May and early J

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