MLB betting trends and analytical systems for September 15

Analytical betting trends and systems for Major League Baseball games on Tuesday, September 15, 2026, have been released. The data, curated by analyst AJ Makinen and the VSiN Analytics team, utilizes betting splits and strength ratings to identify potential plays.

Key trends include observations on teams on winning streaks of five games or more and teams starting new series while on a three-game winning streak. Specific system matches and trend matches are identified for teams including Detroit, Minnesota, Tampa Bay, and Washington. Additionally, the report highlights bullpen strength ratings as a critical factor in handicapping, noting that elite starting pitchers matched against negative bullpen ratings have historically impacted ROI.