| MATCHUP | Oakland Athletics | Seattle Mariners |
|---|---|---|
| Team Records | 11-11 | 10-13 |
| Spread | +1.5 -156 | -1.5 129 |
| Moneyline | +135 | -163 |
| Total | Over 8 (-115) | Under 8 (-105) |
| Where | T-Mobile Park, Seattle, Washington | |
| When | Monday, April 20, 2026 | |
| Time | 09:40 PM EDT | |
| TV | MLB.TV | |
In this article, we will formulate an Athletics vs Mariners Prediction for this MLB matchup on Monday, April 20th in the opening game of this series. Let’s take a look at the prediction for this MLB matchup.
Seattle Mariners Preview
The Seattle Mariners have a 10-13 record this season and are sitting in the fourth place of the AL West. They have a 9-5 home record and are coming off a 5-2 home win against the Rangers. Their previous three games were a 7-3 home win and a 0-5 home loss against the Rangers, and a 2-5 road loss to the Padres.
The Mariners have a .216 batting average this season, .320 OBP and .347 Slugging percentage. Seattle’s pitching staff has a 3.22 ERA and 1.16 WHIP. Luke Raley is the team’s best hitter with a .313 batting average, also leading the team in RBI with 13 and adding a team‑high 5 home runs.
Emerson Hancock (R) is the projected starting pitcher for the Mariners, and he has a 2-1 record, 2.28 ERA and 0.76 WHIP.
Check out Monday’s game between the Braves and Phillies.
Athletics Preview
The Athletics have a 11-11 record this season and are sitting in the first place of the AL West. They have a 6-6 away record and are coming off a 4-7 home loss against the White Sox. Their previous three games were a 7-6 home win and a 2-9 home loss against the White Sox, and a 6-9 home loss against the Rangers.
The Athletics have a .228 batting average this season, .310 OBP and .362 Slugging percentage. Oakland’s pitching staff has a 4.82 ERA and 1.50 WHIP. Shea Langeliers is the team’s best hitter with a .310 batting average, also leading the team in RBI with 12 and adding a team‑high 6 home runs.
J.T. Ginn (R) is the projected starting pitcher for the Athletics, and he has a 0-0 record, 3.31 ERA and 0.98 WHIP.
Athletics @ Seattle Mariners Betting Trends: April 20, 2026
- Probable Starting Pitcher: Emerson Hancock Record this season: 2-1 ERA: 2.28
- Home Record: 2-0
- Last 5 against Athletics: 0-0
Why the Seattle Mariners will win
- The home team has won 14 of the Mariners’ last 15 games.
- The Athletics have lost each of their last five games at T-Mobile Park against teams that held a losing record.
- The Athletics have failed to cover the run line in seven of their last eight games against teams that held a losing record.
- The Mariners have covered the run line in each of their last six Monday games.
- The Athletics have trailed after 3 innings in seven of their last eight games against opponents that held a losing record.
- The Mariners have won the first inning in eight of their last nine home games against AL West opponents.
- The Athletics have trailed after 5 innings in each of their last four games against American League opponents that held a losing record.
- Probable Starting Pitcher: J.T. Ginn Record this season: 0-0 ERA: 3.31
- Road Record: 0-0
- Last 5 against Mariners: 0-0
Why the Athletics will win
- The Athletics have won each of their last five games as road underdogs.
- The Mariners have lost eight of their last nine night games after playing the previous day.
- The road team has covered the run line in 11 of the Athletics’ last 12 games.
- The Mariners have failed to cover the run line in seven of their last eight night games following a win.
- The Athletics have led after 3 innings in each of their last four night games against AL West opponents that held a losing record.
- The Athletics have won the first inning in three of their last four night games against AL West opponents that held a losing record.
- The Athletics have led after 5 innings in each of their last four night games against AL West opponents that held a losing record.
Total Runs Facts
- Eight of the Athletics’ last nine road games after playing the previous day have gone UNDER the total runs line.
- Five of the last six games between the Athletics and Mariners have gone UNDER the total runs line.
- The ‘Inning 1 OVER 0.5 runs’ market has hit in each of the Mariners’ last nine home games.
- The ‘Inning 1 OVER 0.5 runs’ market has hit in eight of the Athletics’ last nine road games against AL West opponents.
Seattle Mariners Player Prop Facts
- Cal Raleigh has hit at least one home run in four of his last eight home appearances against the Athletics after playing the previous day.
- Victor Robles has recorded at least one hit in seven of his last eight home appearances against AL West opponents.
- Luke Raley ranks 5th amongst qualified players for Slugging Percentage (.627) this season.
Athletics Player Prop Facts
- Jeff McNeil has recorded at least one hit in nine of his last 10 appearances against the Mariners.
- Brent Rooker has hit a home run in three of the Athletics’ last five games against the Mariners.
- Shea Langeliers ranks T10th in the league in Hits (26) this season.
Matchup/League Facts
- The Mariners rank 1st in the league for walks allowed this season (54).
- The Mariners rank T2nd in the league for ERA this season (3.22).
- The Athletics rank 29th in the league for walks allowed this season (115).
- The Athletics rank T6th in the league for triples this season (3).
Athletics vs Mariners Prediction
The Mariners are 5-3 in their last 8 meetings against the A’s and are 3-1 in their last 4 meetings in Seattle. Under is 5-1 in their last 6 meetings.
In this Athletics vs Mariners Prediction, the Mariners are coming as -160 home favorites. Both teams have been mediocre this season but the Mariners have back-to-back wins, while the A’s are 1-3 in their last 4. Both pitchers have been excellent this season with a combined 5.59 ERA and sub-1.00 WHIP and both teams average 8.1 runs per game combined, so I don’t expect a high-scoring game today. Take the under 8.5 runs in this one.