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What to know
- MLB’s annual Lou Gehrig Day is observed around June 2. Jun 5
- Every team adds a #4 patch in Yankees font to the left chest of jerseys. Jun 5
- MLB has instituted a league‑wide number 4 patch on uniforms for Lou Gehrig Day Jun 5
- The patch features Yankees colors and appears on the upper left chest Jun 5
Timeline
Jun 5, 2025
Jun 5, 2025