What happened: Denver Post columnist Troy Renck responded to a report that Bryce Harper wants MLB to allow Home Run Derby bonus-round hitters to use metal bats. Renck warned the league would first need to remove young fans and ball-shaggers from the outfield, citing the risk of a 130 mph liner reaching the stands.

Why it matters: Metal bats produce higher exit velocities than the wood bats used in the derby today, raising the stakes for anyone stationed in the outfield during the event. Harper's request, if MLB acts on it, would force organizers to rework outfield logistics before any bonus-round change could be implemented.

What to watch: Watch for any MLB response to Harper's proposal ahead of the next Home Run Derby.