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After 2 trades and a breakout ’26, Mariners prospect Smith leads Seattle’s AFL crop

SCOTTSDALE, Ariz. – The life of a Minor Leaguer can be a transient one. Upward mobility is always a hope, and the possibility of being traded is always there. Mariners No. 13 prospect Boston Smith experienced all of that and…

MLB Official

Published: Friday, 9 October 2026 at 2:30 PM

Key Things to Know

Mariners prospect Boston Smith is headlining Seattle's contingent in the Arizona Fall League after a breakout 2026 season.
Smith hit 31 home runs across multiple minor-league levels during his first full professional season.
The catcher was traded twice in 2026, joining the White Sox before moving to Seattle in the Luis Castillo trade.

The Story in 60 Seconds

Seattle Mariners No. 13 prospect Boston Smith is headlining the organization's contingent in the Arizona Fall League with the Peoria Javelinas. The catcher hit 31 total home runs in 2026 across multiple minor-league levels, breaking out in his first full professional season.

Smith originally signed with the Washington Nationals in 2025 before being traded to the Chicago White Sox for Curtis Mead. He was traded again to Seattle at the 2026 Trade Deadline as part of the Luis Castillo deal.

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After 2 trades and a breakout ’26, Mariners prospect Smith leads Seattle’s AFL crop

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