San Diego Padres vs Seattle Mariners Prediction 4/15/26 MLB Picks Today

The Seattle Mariners and the San Diego Padres meet Wednesday in MLB action from Petco Park. We will look at this from a betting perspective and determine the best bets for this game. Here’s a Seattle Mariners vs. San Diego Padres prediction.

Starting Pitching Matchup

The Seattle Mariners will send out Emerson Hancock for the start here and Hancock is 2-1 with a 2.04 ERA and 19 strikeouts this season. In his career, Hancock is 0-0 with a 1.86 ERA and 6 strikeouts against the Padres. Randy Vasquez will start this one for the Padres and is 1-0 with a 1.02 ERA and 19 strikeouts this season. This will be Vasquez’s first career start against the Mariners.

Seattle Mariners Recap

The Seattle Mariners come into this game looking to bounce back from a 4-1 loss at the hands of the Padres on Tuesday to sit at 8-10 this season. After this series, the Mariners will head home for a series against the Texas Rangers.

Mariners Have Four-Game Win Streak Snapped

Brendan Donovan has 14 hits with 3 doubles, 3 home runs and 6 RBIs while Luke Raley has 3 home runs and 10 RBIs this season. Cole Young’s added 14 hits with 2 doubles, a triple, 2 home runs and 9 RBIs and Cal Raleigh has 10 hits with 2 doubles, 2 home runs and 10 RBIs as well this season. Randy Arozarena has 18 hits with 3 doubles, a home run and 7 RBIs as well on the year.

San Diego Padres Recap

The San Diego Padres come into this game looking to add on to their win over Seattle from Tuesday to climb to 11-6 this season. After this series, the Padres will head on the road for a set against the Los Angeles Angels.

Padres Win 6 In A Row & 9 Of Last 10

Jackson Merrill has 16 hits with 4 doubles, 3 home runs and 11 RBIs while Ramon Laureano has 17 hits with 3 doubles, 4 home runs and 11 RBIs as well on the year. Fernando Tatis Jr. has 16 hits with 4 doubles and 7 RBIs and Xander Bogaerts has 17 hits with 2 doubles, 2 home runs and 11 RBIs. Manny Machado also has 10 hits with 2 doubles, 2 home runs and 9 RBIs as well on the year.

Seattle Mariners @ San Diego Padres Betting Trends: April 15, 2026

• Probable Starting Pitcher: Randy Vasquez      Record this season: 1-0      ERA: 1.02
• Home Record: 1-0
• Last 5 against Mariners: –

Why the San Diego Padres will win

• The home team has won each of the Mariners’ last 10 games.
• The Mariners have lost each of their last 10 Wednesday road games.
• The Mariners have failed to cover the run line in each of their last 12 Wednesday road games.
• The Padres have covered the run line in each of their last six games.
• The Mariners have trailed after 3 innings in seven of their last eight night games against National League opponents that held a winning record.
• The Padres have led after 5 innings in each of their last six games against opponents that held a losing record.

• Probable Starting Pitcher: Emerson Hancock      Record this season: 2-1      ERA: 2.04
• Road Record: 0-1
• Last 5 against Padres: 0-0

Why the Seattle Mariners will win

• The Mariners have won each of their last six games against the Padres following a loss.
• The Padres have lost six of their last seven games against the Mariners following a win.
• The Mariners have covered the run line in seven of their last eight games at Petco Park against teams that held a winning record.
• The Padres have failed to cover the run line in four of their last five home games against American League opponents after playing the previous day.
• The Padres have trailed after 3 innings in four of their last five night games against American League opponents that held a losing record.
• The Padres have trailed after 5 innings in five of their last six night games against American League opponents that held a losing record.
• The Mariners have won the first inning in four of their last five games.

Total Runs Facts

• Seven of the Mariners’ last eight road games have gone UNDER the total runs line.
• Seven of the Padres’ last eight home games against AL West opponents have gone UNDER the total runs line.
• The ‘Inning 1 UNDER 0.5 runs’ market has hit in each of the Padres’ last six games against American League opponents.
• The ‘Inning 1 OVER 0.5 runs’ market has hit in five of the Mariners’ last six night games.

San Diego Padres Player Prop Facts

• Fernando Tatis Jr. has hit a home run in four of the Padres’ last nine games against the Mariners.
• Fernando Tatis Jr. has recorded at least one hit in each of his last 11 home appearances against the Mariners.
• Randy Vasquez ranks 4th amongst qualified players for Earned Run Average (1.02) this season.

Seattle Mariners Player Prop Facts

• Cal Raleigh has hit a home run in three of the Mariners’ last five road games against NL West opponents that held a winning record.
• Julio Rodriguez has recorded at least one hit in each of the Mariners’ last 12 Wednesday night games.
• Emerson Hancock ranks T9th in the league for Wins (2) this season.

Matchup/League Facts

• The Padres rank T1st in the league for home runs allowed this season (10).
• The Padres rank T3rd in the league for doubles this season (35).
• The Mariners rank 1st in the league for walks allowed this season (38).
• The Mariners rank 2nd in the league for ERA this season (3.02).

Seattle Mariners vs. San Diego Padres Prediction

I’m on the under in this one. I just think that while both of these starters’ starts to the season are not likely sustainable, they’re off to quite the start and Seattle’s offense continues to sputter. For me this feels like a similar result to Tuesday with 5 or 6 runs scored, so give me the under here.