by Rod Pearson
Thursday, May 14, 2026
Game Time: 9:40 pm ET, Friday, May 15, 2026
Venue: T-Mobile Park, Seattle, WA
Where to Watch: MLB TV
Opening Odds at USA Sportsbooks
DraftKings: Moneyline odds: Padres +119, Mariners -143; Over/Under: 7.5 runs
Bet365: Moneyline odds: Padres +120, Mariners -140; Over/Under: 7.5 runs
BetMGM: Moneyline odds: Padres +120, Mariners -145; Over/Under: 7.5 runs
Season Record
San Diego Padres: 25-17 (1st place, NL West)
Seattle Mariners: 21-23 (3rd place, AL West)
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Recent Form
San Diego Padres: 6-4 last 10
Seattle Mariners: 5-5 last 10
San Diego Padres vs Seattle Mariners Preview and Analysis
The Padres are entering this series off a loss and lost their 3-game series against the Milwaukee Brewers 2-1 in their last series. They enter this game with a 25-17 record overall and have a road record of 12-7. This is the series opener of a 3-game series with the Mariners on Friday. Their offense ranks 28th in the MLB with a .662 OPS. Griffin Canning was their starting pitcher on Thursday while Randy Vásquez is making his start in this game on Friday. He is 4-1 with a 3.05 ERA this season. His team won 7 of their last 8 games this season with him making an appearance. In his last MLB regular season appearance, he allowed 1 ER, 0 HR, and 0 BB with 6 SO on 6 hits through 5 IP against the St Louis Cardinals.
The Mariners are entering this series off a win and won their 4-game series against the Houston Astros 3-1 in their last series. They enter this game with a 21-23 record overall and have a home record of 12-11. This is the 1st game of a 3-game series with the Padres on Friday. Their offense ranks 17th in the MLB with a .702 OPS. Luis Castillo was their starting pitcher on Thursday while Emerson Hancock is making his start in this game on Friday. He is 3-1 with a 3.21 ERA this season. His team won 2 of their last 3 games this season with him making an appearance. In his last MLB regular season start, he allowed 5 earned runs, 1 homer, and 3 walks with 4 strikeouts on 5 hits through 6 innings pitched against the Chicago White Sox.
Padres vs Mariners Prediction
The current betting odds have the Padres listed as a slight underdog in this game according to Draftkings Sportsbook. The Padres have looked great in their games this season with their 25-17 record overall which has them right at the top of the NL West. They have been a good road team too with their 12-7 road record this year. Meanwhile, the Mariners haven't looked great in their games this season with their 21-23 record overall which has them right in the middle of the AL West. They have looked better in their own ballpark though with their 12-11 home record this season. The Mariners have been starting to roll lately, winning their last series against the Astros, but they are still 5-5 in their last 10 games and have been really up and down this season. The Padres don't have the best offense this season, but they do have a really good pitching staff and they have still been the hotter team lately, going 6-4 in their last 10 games. Hancock is on the mound for the Mariners here and he hasn't been bad this season. He is 3-1 with a 3.21 ERA and the team has been having success lately, winning 2 of their last 3 games with him, but he is coming off a really bad start in his last one. He gave up 5 earned runs in his last start and that is going to get his team into trouble here. Vasquez is on the mound for the Padres in this one and he has been having a great season. He is 4-1 with a 3.05 ERA and the team has been having a ton of success with him too. He only gave up 1 earned run in his last start which has been a common theme for him over the last few seasons, and the team has won 7 of their last 8 games with him starting too. The Padres are going to be motivated to bounce back in this series and they do have the better pitching matchup here along with the better bullpen to back them up too. The best way to place a bet here is on the Padres to win this game.
Padres Mariners Prediction: Our MLB Pick for Friday, May 15, 2026 (9:40 pm ET start time) is Padres 3 Mariners 1.
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MLB Betting Trends
San Diego Padres: 214-163 (+28 units) on the moneyline in all games. 101-87 (+18.2 units) on the moneyline in road games. 74-67 (+27.5 units) on the moneyline as an underdog of +100 or higher. 25-13 UNDER against AL West opponents. 44-28 UNDER vs. an AL team with a slugging percentage .410 or worse on the season.
Seattle Mariners: 202-178 (-9.5 units) on the moneyline in all games. 147-114 (-11.3 units) on the moneyline as a favorite of -110 or higher. 143-128 (-13.1 units) on the moneyline against right-handed starters. 8-3 UNDER revenging a same season 3 game sweep at the hands of their opponents. 6-3 UNDER in an inter-league game.
Key Injuries
San Diego Padres: L. Campusano (C) Ten Day IL - Toe. J. Cronenworth (2B) Seven Day IL - Concussion. G. Marquez (SP) Fifteen Day IL - Forearm. B. Hoeing (RP) Sixty Day IL - Elbow. N. Pivetta (SP) Fifteen Day IL - Elbow. J. Musgrove (SP) Sixty Day IL - Elbow. J. Brito (RP) Sixty Day IL - Elbow.
Seattle Mariners: C. Raleigh (C) Day To Day - Side. G. Speier (RP) Fifteen Day IL - Shoulder Inflammation. W. Wilson (3B) Ten Day IL - Thumb. M. Brash (RP) Fifteen Day IL - Lat. M. Mastrobuoni (3B) Sixty Day IL - Calf. P. Wisdom (1B) Ten Day IL - Oblique. V. Robles (RF) Ten Day IL - Pectoral. C. Vargas (RP) Sixty Day IL - Lat. L. Evans (SP) Sixty Day IL - Arm.
Notable Quotes
“Maybe he’s playing there a little more than I expected. But Jake (Cronenworth) being injured and (Sung-Mun) Song being new to the Major Leagues probably has something to do with that as we try to create a little more offense.” - Craig Stammen on Fernando Tatis Jr playing 2nd base more this season.
“It was just a play on defense and it kind of was awkward for him. So as a precaution, we said, ‘Let’s get you out tonight.'” - Dan Wilson on the injury to Cal Raleigh.
Starting Lineups
San Diego Padres
Xander Bogaerts (R) SS
Fernando Tatis Jr. (R) 2B
Manny Machado (R) 3B
Miguel Andujar (R) DH
Gavin Sheets (L) 1B
Ramón Laureano (R) LF
Nick Castellanos (R) RF
Freddy Fermin (R) C
Bryce Johnson (S) CF
Seattle Mariners
Brendan Donovan (L) 3B
Julio Rodríguez (R) DH
Josh Naylor (L) 1B
Randy Arozarena (R) LF
Luke Raley (L) CF
J.P. Crawford (L) SS
Dominic Canzone (L) RF
Mitch Garver (R) C
Cole Young (L) 2B
Statistical Leaders
San Diego Padres
Batting Average: Miguel Andujar (.297)
Hits: Xander Bogaerts (39)
Home Runs: Xander Bogaerts (7)
RBI: Xander Bogaerts (23)
Stolen Bases: Fernando Tatis (10)
Wins: Randy Vásquez (4)
Saves: Mason Miller (13)
ERA: Yuki Matsui (0.00)
Seattle Mariners
Batting Average: Jhonny Pereda (.400)
Hits: Randy Arozarena (49)
Home Runs: Luke Raley (10)
RBI: Luke Raley (27)
Stolen Bases: Randy Arozarena (11)
Wins: George Kirby (5)
Saves: Andrés Muñoz (8)
ERA: Matt Brash (0.00)
Managers:
San Diego Padres: Craig Stammen (1st season)
Seattle Mariners: Dan Wilson (3rd season)
Rod Pearson
About the Author:
Rod Pearson has been a rabid sports fan his entire life. He grew up in Ontario, and was skilled in both hockey and baseball, and pitched in an elite baseball league for many years. In 2022, Rod decided to hang up his glove, so that he could write about the sports he loves -- but from a gambling perspective. Join Rod every day as he breaks down the games to find the best betting value.
