Astros vs Mariners: How to Make Money Betting This Monday MLB Game

Monday night in Seattle sets up a classic AL West divisional clash. George Kirby, who the Astros have seen plenty over the years, is a favorite against Mike Burrows and the Astros. I have a play I love in this matchup tonight that involves isolating the starting pitchers, and backing the underdog in the F5.

This is the ultimate buy-low opportunity on Houston. The Astros enter this game on a seven-game losing streak. They’re 6-10 overall and a dismal 1-8 on the road early in 2026. Losses have piled up in frustrating fashion, with late-inning meltdowns and missed opportunities. But this is still a veteran, championship-caliber club loaded with proven hitters like Yordan Alvarez. Slumps like this create value. Houston’s offense hasn’t vanished overnight; it’s simply pressing. After a week-plus of scuffling, regression to the mean is coming, and the first five innings are where that turnaround is happening. Expect the Astros to come out with more energy early on in this one. The smart money is buying low on the proven Astros while the public is piling on the Mariners. 

On the flip side, sell high on the Mariners. Seattle has won three straight against these same Astros, clinching the first three games of this four-game set. The market is riding that hot streak, but the wins have been deceptive. A closer look at the series shows the Mariners did much of their damage after the fifth inning—14 of their last 23 runs in the series came from the sixth onward. Early in games, the contests stayed tight. Seattle is 7-9 overall and still finding its footing. Kirby may be their best arm, but fading a team after a three-game surge against a slumping rival is classic overreaction territory.

Familiarity is another massive edge for Houston. The Astros have seen George Kirby plenty over the years—nine career appearances against them totaling more than 50 innings. Kirby owns solid numbers in those outings (3-1, 2.15 ERA), but repeated exposure works both ways. Houston’s hitters know his pitch mix, his sequencing, and his tendencies. Division rivals like these develop familiarity with each other quickly, and the Astros’ veteran lineup has the plate discipline to work counts and capitalize early. Kirby’s 2026 form (1-2, 3.60 ERA, 0.90 WHIP) shows some cracks—he’s already allowed three home runs in just 20 innings. That’s not the untouchable version of Kirby we’ve seen in the past.

Houston’s starter, Mike Burrows, has been inconsistent (5.63 ERA), but F5 betting is less about complete-game dominance and more about surviving the first and second trips through the order. The Astros’ bats have still produced runs even during the skid, and early-season small-sample quirks often favor the more experienced club in short bursts. Seattle’s late-inning scoring pattern in this very series further supports the idea that the first five will be competitive or even lean Houston’s way.

In short, the F5 +0.5 on the Astros is the perfect spot to buy low on a proud franchise shaking off a slump, sell high on a modest Mariners win streak, and lean on years of divisional familiarity. Expect Houston to hold its own through five innings. Take the Astros F5 +0.5 and watch the early momentum swing their way. I’ll meet you at the cash counter when the Astros are winning or tied through the first five innings.