Invisible Insider
July 20, 2025
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Astros at Mariners MLB Betting Preview

Game Time: 7/20, 04:10 PM

1. Brief Intro

The Houston Astros face off against the Seattle Mariners in a pivotal matchup set for July 20th at 4:10 PM. According to DraftKings, the Seattle Mariners are favored at -123 with the Astros as a +101 underdog, and a significant 87% of the betting money is backing the Mariners. This game features intriguing pitching matchups that could dictate the outcome.

2. Pitcher Breakdown

Pitching Matchup: Hunter Brown vs. Bryan Woo
Hunter Brown (HOU):

Hunter Brown brings a diverse arsenal to the mound, featuring a Four-Seam Fastball (40% usage, 96.9 mph), Sinker (20% usage, 96.0 mph), Curveball (17% usage, 83.8 mph), Changeup (13% usage, 88.4 mph), Cutter (5% usage, 93.1 mph), and Slider (5% usage, 90.7 mph). Brown's velocity-heavy style could pose challenges for the Mariners, especially considering they average .262 this season with a projected xBA of .262 against Brown's offerings.

Bryan Woo (SEA):

Bryan Woo will counter with his own mix, led by a Four-Seam Fastball (45% usage, 95.6 mph), Sinker (25% usage, 95.2 mph), Slider (12% usage, 88.3 mph), Changeup (9% usage, 89.7 mph), and Sweeper (9% usage, 84.4 mph). The Astros lineup, averaging .269 this season, projects to a .247 xBA against Woo's arsenal, indicating a potential edge for Woo.

3. Lineup Advantage vs. Arsenal

Lineup Matchups & Batting Edges
For Away Team vs. Home Pitcher:

The Astros lineup, which averages .270 this season, projects to a .247 xBA against Woo's arsenal. The batter with the biggest decrease is Cam Smith, whose season BA of .324 drops to an xBA of .263 (-61 points), with his strikeout rate increasing from 17.8% to 21.9% (+4.1%). Victor Caratini, however, shows improvement, with a season BA of .265 rising to an xBA of .285 (+20 points).

For Home Team vs. Away Pitcher:

The Mariners lineup, averaging .263, projects almost identically at .262 against Brown. Jorge Polanco shows a notable increase, with his season BA of .257 improving to an xBA of .291 (+34 points), while Dominic Canzone experiences a decrease from .320 to .294 (-26 points).

4. Lineup Strikeout Trends vs. Arsenal

Strikeout Risks & Rewards

The Astros' projected K-rate is 23.1% versus Woo, up 2.9% from their 20.2% season average. Meanwhile, the Mariners' strikeout rate is expected to be 21.0% against Brown, a slight increase of 0.6% from their season average of 20.4%.

5. Umpire Influence

Behind the Plate: TBA

Umpire assignment has not been announced, which makes prop volatility a concern. As such, any potential umpire influence on strikeouts or walks remains unknown.

6. Betting Interpretation / Final Lean

Final Lean & Betting Takeaway

STEP-BY-STEP BETTING ANALYSIS:

STEP 1: Check ALL individual batters for prop opportunities
No batters from either team meet our criteria of having an xBA greater than .300 with a boost of more than +20 points. Therefore, there are no significant batter prop leans.

STEP 2: Check team strikeout rates for pitcher props
The Astros' projected strikeout rate of 23.1% does not meet the criterion of being above 25% with an increase of over 4%. Similarly, the Mariners' slight K-rate increase to 21.0% does not meet our threshold. Thus, no strikeout prop leans are suggested.

STEP 3: Report findings
No significant statistical edges meet our betting threshold in this matchup.

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