First Seasons

Find leaders across the first seasons of a career.

Career Window Finder

Ask a first-seasons baseball question

For team filters, totals use the counted early-career seasons tied to that club or franchise.
Question Most HR in first 2 career seasons Hitters, all teams, 1901-2026
Players -- qualified result pool
Leader -- Run a search to load leaders
Data Ready MLB Stats API season data

Leaderboard

First-season leaders

Choose a question, then hit View.