Seattle Mariners trade grade — 2026 deadline report card

How we grade Seattle Mariners

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.

Seattle Mariners overall grades

Outlook C · Season A+ across 3 deals.

Seattle Mariners reshaped across 3 deals (-1 players; 2 MLB in / 2 MLB out). Outlook C · Season A+.

Seattle Mariners deadline deals

3 trades in our 2026 deadline window:

• Outlook F · Season A-: got Taylor Ward; sent Alex Hoppe, Brock Moore, Harrison Kreiling. Gets Taylor Ward; sends Alex Hoppe, Brock Moore, Harrison Kreiling. Season +31; Outlook -88.
• Outlook A+ · Season A+: got Seranthony Domínguez, Nolan Jones, Boston Smith; sent Luis Castillo. Gets Seranthony Domínguez, Nolan Jones, Boston Smith; sends Luis Castillo. Season +60; Outlook +126.
• Outlook F · Season C+: sent Carson Taylor. Gets cash/PTBNL; sends Carson Taylor. Season +0; Outlook -52.

All team trade deadline grades

• 2026 MLB trade deadline grades (all 30 teams)
• New York Mets trade grade — Outlook A+ · Season F
• Colorado Rockies trade grade — Outlook A+ · Season F
• Los Angeles Angels trade grade — Outlook A+ · Season F
• Detroit Tigers trade grade — Outlook A+ · Season F
• St. Louis Cardinals trade grade — Outlook A+ · Season F
• Miami Marlins trade grade — Outlook A+ · Season C
• Washington Nationals trade grade — Outlook A+ · Season F
• Baltimore Orioles trade grade — Outlook A+ · Season F
• Toronto Blue Jays trade grade — Outlook A+ · Season D+
• San Francisco Giants trade grade — Outlook A · Season F
• Oakland Athletics trade grade — Outlook A- · Season D+
• Houston Astros trade grade — Outlook B+ · Season F
• Kansas City Royals trade grade — Outlook B+ · Season C
• Cincinnati Reds trade grade — Outlook C+ · Season F
• Boston Red Sox trade grade — Outlook D+ · Season A+
• Atlanta Braves trade grade — Outlook D- · Season B
• Pittsburgh Pirates trade grade — Outlook D- · Season A+
• Philadelphia Phillies trade grade — Outlook F · Season A+
• New York Yankees trade grade — Outlook F · Season B+
• Cleveland Guardians trade grade — Outlook F · Season A+
• Texas Rangers trade grade — Outlook F · Season A+
• Milwaukee Brewers trade grade — Outlook F · Season A+
• Los Angeles Dodgers trade grade — Outlook F · Season A+
• Chicago Cubs trade grade — Outlook F · Season A+
• Arizona Diamondbacks trade grade — Outlook F · Season B+
• San Diego Padres trade grade — Outlook F · Season A+
• Minnesota Twins trade grade — Outlook F · Season A+
• Chicago White Sox trade grade — Outlook F · Season B
• Tampa Bay Rays trade grade — Outlook F · Season A+

More Seattle Mariners on EasyMLB

• Seattle Mariners playoff odds & chances of making the playoffs
• MLB playoff race & wild card odds
• Fantasy baseball team builder & rankings
• MLB fun stats — unique pitchers & RISP/2-out BA