Mariners vs Cubs MLB Player Prop Picks (Jun 20)

The Mariners (37–36) visit Wrigley Field aiming to rebound from a 2–1 loss on Thursday, while the Cubs (45–29) look to extend their home success. Chicago enters as a -130 moneyline favorite in this interleague match, with an over/under around 9.5 runs. First pitch is at 2:20 p.m. ET at Wrigley Field.

• The Cubs are 24–12 at Wrigley and have won eight of their last ten meetings vs. Seattle.
• Seattle will start George Kirby (1–3, 5.96 ERA, 30 K), while the Cubs counter with Cade Horton (rookie, 0–0, 3.47 ERA).
• The total reflects a balanced expectation, but pitching volatility from Kirby and rookie Horton may favor the under.

Seattle Mariners Player Prop Pick: George Kirby

Seattle is back to .500 after a 6–1 home sweep of Minnesota, but their ERA and WAWS are near average. Kirby has struggled with a 5.96 ERA but offers strikeout upside (30 K in 25.2 IP). The lineup is led by Cal Raleigh (27 HR) and J.P. Crawford (.294/.416/.408).

• Kirby averages 10.5 K/9 (30 K in 25.2 IP), but has exceeded five strikeouts only once..
• Cubs rank among the MLB’s lowest in strikeout rate.
• His contact-prone repertoire makes high-K outings less likely.

Chicago Cubs Player Prop Pick: Cade Horton

The Cubs have built momentum at home behind strong bullpen depth and clutch bats. Pete Crow‑Armstrong (20 HR/20 SB), Seiya Suzuki (18 HR), and Kyle Tucker fuel their offense. Horton has shown promise in limited starts, and Chicago’s pitching staff holds a top-10 ERA nationally.

• In his limited action, Horton has posted a 3.47 ERA with a promising strikeout rate.
• He faces a Mariners side that strikes out more often (around 649 Ks this season).
• As a rookie star pitcher, Horton has whip plus upside to reach this line on the road.