What happened: MLB's account asked fans which reliever they would trust to protect a one-run lead in the ninth inning, offering a choice between Aroldis Chapman and Mason Miller. The prompt ran as part of an MLB x Sage USA America poll series pitting closers against each other.

Why it matters: Chapman enters the matchup as the same Aroldis Chapman who became the all-time strikeout leader among relief pitchers, while Miller has drawn trade interest from the Braves, Yankees and Rays ahead of the deadline, giving the hypothetical added weight beyond a simple fan poll.

What to watch: Watch for how the trade market values Miller as the deadline nears, and whether Chapman extends his career strikeout total this season.