Why bullpens decide more games than you think

OddsShift · Jun 29, 2026

Everyone watches the starting pitcher. Sharp bettors watch the bullpen.

As the season wears into summer, bullpen fatigue becomes one of the most underrated factors in baseball. A team that played a 12-inning game last night, or burned three relievers two days running, is vulnerable late — no matter who starts.

Look for teams whose high-leverage arms have been overused, and for games where a starter is on a tight pitch count. Those are the spots where a close game tips in the late innings. The first five innings get the attention; the last four decide the money.