What happened: Major League Baseball on Monday decried the use of personal writings on team-issued Pride Night hats after members of the San Francisco Giants had Bible verses etched into their caps during Friday night's game against the Chicago Cubs. The league has since issued a warning to the players involved over the unauthorized markings.

Why it matters: The move puts MLB at the center of a fight over personal and religious expression versus uniform policy on a league-designated theme night. Critics argue the league has long tolerated personal additions to caps, including memorial initials, raising questions about consistent enforcement.

What to watch: Watch whether MLB clarifies its uniform policy or moves toward formal discipline, and how the players and union respond to the warning.