Red Sox vs Mariners MLB Player Prop Picks (Jun 18)

First pitch is scheduled for 7:10 p.m. ET at T‑Mobile Park. The Red Sox (38–37) visit the Mariners (37–35) in the rubber game of their three-game series. Both clubs enter the finale on the heels of offensive and pitching swings, making this one of the tighter matchups of mid‑June.

• Boston relies on ace Garrett Crochet (6–4, 2.24 ERA, 117 strikeouts), while Seattle starts veteran Luis Castillo (4–4, 3.29 ERA, recent struggles).
• The Red Sox are favored on the moneyline (around –120), with the total set close to 6.5 runs.
• Seattle’s rotation is healthy with Logan Gilbert returning; their offense remains streaky but Cal Raleigh has provided pop.

Boston Red Sox Player Prop Pick: Garrett Crochet

Boston has found momentum recently, ranking in the top six for runs per game and slugging percentage. The young lineup is taking shape post-Devers with prospects like Marcelo Mayer emerging alongside veterans Bregman and Story. Garrett Crochet has been dominant—averaging over 7.5 strikeouts per start and delivering nine quality starts in fifteen outings.

• Crochet leads in AL strikeouts (117), averaging nearly eight Ks per nine innings.
• He has exceeded eight strikeouts in three of his last four starts, including double-digit Ks in two.
• Seattle ranks in MLB’s top-5 in strikeout rate against left-handers—ideal matchup for a K-heavy starter.

Seattle Mariners Player Prop Pick: Luis Castillo

Seattle carries momentum from recent series wins with three effective starters: Gilbert, Woo, and Castillo. Gilbert’s return brings a sub‑0.80 WHIP and 10 strikeouts over five innings in his latest start. The offense is inconsistent beyond Julio Rodríguez and Cal Raleigh but has shown power in spurts.

• Castillo has surrendered multiple runs in recent outings but has recorded three or fewer earned runs in about 50% of his starts.
• The Red Sox offense has been streaky, with recent matchups dominated by pitching duels.
• Castillo has pitched at least five innings in 11 straight starts, indicating a reliable baseline performance.