What happened: Luis Arraez brings an expiring contract, 3.1 WAR and a 136 adjusted OPS to the market. Luke Weaver has allowed no earned runs in 14 appearances since June 1, while Robbie Ray and Michael Wacha offer rotation depth. Mason Miller, Tyler Stephenson, Foster Griffin and Jake McCarthy also present varied options for contenders.

Why it matters: Short-term acquisitions could strengthen postseason rosters without requiring long commitments. Clubs near the wild-card cutoff must also weigh immediate help against the prospect cost and value of retaining controllable talent.

What to watch: Seller decisions and prospect prices will come into focus before Monday's 6 p.m. ET cutoff.