EasyMLB.com
Did the Seattle Mariners win the 2026 MLB trade deadline? See Outlook and Season letter grades, players gained and lost, deal-by-deal report cards, and how each trade stacks up on EasyMLB.com.
Outlook asks whether the club improved its longer-term asset sheet (prospect packages and controllable pieces). Season asks whether the roster got better for the rest of 2026 using fantasy position ranks and production. Contenders often look better on Season; sellers often look better on Outlook.
Outlook D- · Season C+ across 3 deals.
Seattle Mariners spent farm capital across 3 deals (-1 players; 0 MLB in / 0 MLB out). Outlook D- · Season C+.
3 trades in our 2026 deadline window: