The Astros continue their third consecutive road series at T-Mobile Park in Seattle, with Japanese right-hander Tatsuya Imai set to take the bump for Houston.
Emerson Hancock will take the mound for the Mariners. The 26-year-old will surely look to build upon a scorching start to his 2026 campaign — he’s allowed just one earned run across nearly 13 innings so far.
Let’s get into my Astros vs Mariners predictions and picks for Friday, April 10.
Astros vs Mariners Prediction and MLB Parlay Picks
- Mariners ML
- Josh Naylor Over 1.5 Hits + Runs + RBIs
Parlay Odds: +180 (bet365)
Astros vs Mariners Odds
| Astros Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 -184 | 7.5 -115o / -105u | +114 |
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 +152 | 7.5 -115o / -105u | -134 |
MLB Same Game Parlay Playbook: Astros vs Mariners
Though the Astros’ Tatsuya Imai was a highly-touted prospect from the NPB league in Japan, the righty has had a rough start to his MLB career, posting a 4.30 ERA with a WHIP north of 1.50 across his first two outings.
On the surface, Houston’s rookie dominated back in Japan (1.80 ERA in 2025), but he has serious command issues, posting the highest walk rate among NPB pitchers with at least 200 innings pitched between 2019 and 2021.
The NPB also uses different baseballs than those used in MLB, which has caused severe degradation in his fastball shape — it’s become relatively flat, which is super vulnerable to hard contact.
In the other dugout, Emerson Hancock has looked great in his first few 2026 starts. He’s got an elite arsenal, and he’s starting to lean more into his sinker and sweeper this season.
Hancock boasts an incredibly low arm angle, resulting in more movement on his breaking pitches. Plus, his 95 MPH fastball-sinker combination has generated a unique combination of whiffs and weak contact.
I feel great backing the Mariners at home with a clear pitching edge. It’s also worth mentioning that the Astros are on the back end of a long road trip.
In addition to his command issues, Imai has struggled against righties — both in Japan and in his first few MLB starts.
He relies heavily on his four-seam fastball and slider, but both are vulnerable to hard contact from southpaws. Plus, I think his arsenal is limited.
He’s had a slow start to the season, but Josh Naylor matches up well with Imai.
Naylor is a disciplined southpaw with great patience and a strong contact profile. He can both draw walks and drive in runs, so I like targeting him in the hits + runs + RBI market for this contest.
I expect the Mariners to bash Imai early, and Naylor should have several chances to either score himself or drive some runs in.
SGP Picks:
- Mariners ML
- Josh Naylor Over 1.5 Hits + Runs + RBIs
Parlay Odds: +180 (bet365)
