What's at stake

Which team wins tonight settles the moneyline market and affects head-to-head records and short-term betting outcomes.

A Cubs -1.5 cover requires Chicago to win by two or more runs. The Over/Under 8.5 decides whether the teams combine for nine or more runs.

Who's in play

Starting pitchers and bullpen arms are the primary on-field actors for both moneyline and run-line outcomes.

Key hitters in the middle of each lineup, defensive replacements, and managers' matchup choices also determine scoring and late-inning comebacks.

What drives it

Pitching matchups, especially the two starters' command and recent innings, shift expectations for a low- or high-scoring game.

Weather, ballpark factors, and lineup handedness also push the total one way or the other; late scratches or a short outing from a starter can flip the run-line market.

What to watch

Lineups and official probable pitchers, typically posted an hour before first pitch, are the immediate signals for bettors and oddsmakers.

Also watch weather forecasts, last-minute scratches, bullpen usage in earlier games, and the first inning's scoring pace to gauge whether the game stays under or exceeds 8.5 runs.