What happened: Alonso locked up the AL RBI lead during the final weekend of the 2026 regular season. He previously led the NL in RBI in a separate season.
Why it matters: No player had led both leagues in RBI in different seasons before. The split-league double marks sustained run production across leagues and rosters.
By the numbers: No. 42 on Sept. 25 gave Alonso sole possession of the AL home-run lead.
What to watch: Final RBI margins confirm after the season finale. Postseason seeding then sets Alonso's next game.