The Seattle Mariners host the Athletics on April 20, 2026. First pitch from T-Mobile Park is scheduled for 9:40 p.m. EDT. The game will be broadcast on NBCS-CA.
The Mariners are favored by -143 on the moneyline and by -1.5 on the run line. The A's are +119 on the moneyline and +119 on the run line. The total is set at 8 runs.
Find my MLB picks and Athletics vs Mariners prediction below, as well as probable pitchers, weather report, and more.
Athletics vs Mariners Prediction
- Athletics vs Mariners Pick: Under 8.5
My Athletics vs Mariners best bet is on game totals. Make sure to find the best odds by checking our live MLB odds page.
Athletics vs Mariners Odds
| Athletics Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 -168 | 8 -115o / -105u | +119 |
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 +139 | 8 -115o / -105u | -143 |
- Athletics vs Mariners moneyline: A's +119, Mariners -143
- Athletics vs Mariners over/under: 8 (-115 / -105)
- Athletics vs Mariners spread: A's +1.5 (-168), Mariners -1.5 (-143)
Athletics vs Mariners Probable Pitchers
| RHP J.T. Ginn (OAK) | Stat | RHP Emerson Hancock (SEA) |
|---|---|---|
| 0-0 | W-L | 2-1 |
| 0.1 | fWAR (FanGraphs) | 0.7 |
| 3.31 / 3.05 | ERA / xERA | 2.28 / 2.80 |
| 4.66 / 4.58 | FIP / xFIP | 2.75 / 2.98 |
| 0.98 | WHIP | 0.76 |
| 6.3% | K-BB% | 24.7% |
| 50.0% | GB% | 43.6% |
| 100 | Stuff+ | 107 |
| 105 | Location+ | 109 |
Athletics vs Mariners MLB Betting Preview
Athletics Betting Preview
All things considered, the Athletics have put together a decently impressive rotation to this point given the talent and budget they've got. One of the brighter spots is J.T. Ginn, who's come off a disappointing 2025 season and rebounded in a big way over his first 16 1/3 innings this year.
Ginn's 2025 was a classic case of a groundball pitcher being victimized by the wrong surroundings. A move to Sacramento last year meant more home runs, and despite being a heavy ground-baller, Ginn was taken deep 17 times in 90 1/3 innings. He did manage a pretty decent 25.3% strikeout rate, but he gave up a ton of hard-hit balls, which meant the ones that inevitably came back in the air had a good shot at getting out.
The other issue was the Athletics' infield defense, which ranked seventh-worst in Outs Above Average. Given all the contact on the ground, Ginn deserved a bit better than the 5.08 ERA he wore, and that's why he was so "unlucky" to pitch above his 3.74 Expected ERA and .227 Expected Batting Average.
This season's been much kinder to the Athletics' pitchers with the infield currently sitting seventh in OAA, and Ginn has looked much better as a result — allowing just a .161 average and a 3.31 ERA.
The improvement in defense has definitely helped Ginn see that positive regression, but his low 28.9% hard-hit rate has something to do with that too. He may be way down to a 17.5% strikeout rate, but that .205 xBA will work well. It remains to be seen if he'll continue trading in strikeouts for weak contact, and if his bloated 11.1% walk rate will be the side effect.
Seattle Mariners Betting Preview
While Ginn's trajectory has been pointing up dating back to his unlucky 2026, Emerson Hancock's season is a bit harder to explain — and equally hard to read into. Sure, he's got the pedigree as a former top-10 pick, but in three big league seasons — and several stops in the minor leagues — he's looked like a wildly volatile and hittable pitcher.
Hancock's biggest issue was his lack of strikeouts, because his numbers on contact were so dreadful. His fastball was crushed a year ago to the tune of a .316 average and .441 slugging percentage, and while it's normal to see opponents squaring up a pitcher's fastball, the lack of whiffs on it — and whiffs on any particular pitch — made it a huge issue.
This year, Hancock has ratcheted things up to the tune of a 29.4% strikeout rate and he's come through four starts with a .206 xBA. A slight increase in average launch angle has led to a higher fly ball rate, and that will bring anyone a higher percentage of expected outs — especially pitching in Seattle.
Hancock's allowed two home runs in two road starts already, allowing three runs in the process on 10 hits over 12 2/3 innings, and while his ERA is just a hair higher at home, he's allowed just four hits in 11 innings. He's a far more hittable pitcher on the road, which is bad news for the Athletics, and while this is an incredibly small sample size to say anything nice about Hancock, this is ultimately the spot you'd want to believe in him.
Athletics vs Mariners Pick, Betting Analysis
The Athletics are coming into this one with a weak .134 Isolated Power and a hefty 25% strikeout rate, and while Seattle has technically been a better offense it's had nearly identical issues in the strikeout and power departments. Seattle's numbers have been slightly more reliant on walks, and the Athletics have done a better job of racking up hits.
That should play nicely in Seattle for a nice 'ole under here. We know Seattle is an under paradise, and that's why taking this line at 8.5 runs is a must. The books aren't buying the starts for Ginn and Hancock — and to be clear I am certainly not either. I think Ginn's got a better shot of remaining steady in the back end of the rotation, but both of these guys looked like batting practice just eight short months ago.
I do believe in good spots, however, and this is a great one for both pitchers. Hancock should be able to keep up the strikeout pace with the Athletics ranking down near the bottom of the league, and their lack of power heading into a pitcher's park doesn't have me overly concerned about Hancock allowing homers. Ginn, meanwhile, keeps the ball on the ground, and the Mariners do not have enough consistency on offense to punch across runs with a parade of hits. Both men have generally been solid in the walk department as well, so that should just about kill all offense here.
Pick: Under 8.5 (-120) | Bet to Under 8 (-110)
