September baseball means expanded rosters, playoff races and math for teams in postseason contention. The Philadelphia Phillies are seeking to clinch their fourth straight playoff berth and also win their second straight National League East title.

With 18 games left in the regular season, it's now officially magic number season in Philadelphia. The Phillies' magic number to clinch a postseason berth is in single digits, and it's nearly in single digits to win the NL East. A first-round bye is also on the table.

Here's everything fans need to know as the Phillies enter the final stretch of the regular season.

What is a magic number, and how is it calculated?

Baseball uses the term "magic number" to determine how close teams are to punching their tickets to the postseason or winning the

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