Giants vs Mariners Prediction 7/17/26 MLB Picks Today

In this article, we will formulate a Giants vs Mariners Prediction for this MLB matchup on Friday, July 17^th 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 48-49 record this season and are sitting in the 2nd place of the AL West. They have a 27-20 home record and are coming off an 8-2 road win against the Rays. They will face the Reds and the Rangers next.

The Seattle Mariners have a .230 batting average this season, .310 OBP and .380 Slugging percentage. Seattle’s pitching staff has a 3.61 ERA and 1.18 WHIP. Randy Arozarena is the team’s best hitter with a .286 batting average and also leads the team in RBI with 45, while Dominic Canzone adds a team-high 15 home runs.

Bryce Miller (R) is the projected starting pitcher for the Seattle Mariners, and he has a 4-3 record, 2.18 ERA and 0.83 WHIP.

San Francisco Giants Preview

The San Francisco Giants have a 41-55 record this season and are sitting in the 4th place of the NL West. They have a 19-30 away record and are coming off a 3-1 home win against the Rockies. They will face the Royals and the Angels next.

The San Francisco Giants have a .256 batting average this season, .310 OBP and .420 Slugging percentage. San Francisco’s pitching staff has a 4.46 ERA and 1.37 WHIP. Luis Arraez is the team’s best hitter with a .330 batting average. Rafael Devers leads the team in RBI with 52, adding a team-high 19 home runs.

Landen Roupp (R) is the projected starting pitcher for the San Francisco Giants, and he has a 6-8 record, 4.27 ERA and 1.31 WHIP.

San Francisco Giants @ Seattle Mariners Betting Trends: July 17, 2026

• Probable Starting Pitcher: Bryce Miller      Record this season: 4-3      ERA: 2.18
• Home Record: 1-1
• Last 5 against Giants: 0-1

Why the Seattle Mariners will win

• The Giants have lost each of their last eight Friday night games.
• The Mariners have won 10 of their last 11 home games against National League opponents that held a losing record.
• The favorites have covered the run line in six of the Mariners’ last seven games at T-Mobile Park.
• The Giants have failed to cover the run line in six of their last seven games against AL West opponents following a home win.
• The Giants have trailed after 5 innings in each of their last six Friday night games as underdogs.
• The Giants have lost the first inning in four of their last five games as road underdogs.
• The Mariners have led after 3 innings in each of their last five night games against National League opponents that held a losing record.

• Probable Starting Pitcher: Landen Roupp      Record this season: 6-8      ERA: 4.27
• Road Record: 3-4
• Last 5 against Mariners: 0-0

Why the San Francisco Giants will win

• The Mariners have lost each of their last five games as favorites against the Giants following a win.
• The Giants have won each of their last five games as road underdogs against American League opponents following a home win.
• The underdogs have covered the run line in each of the Giants’ last nine games at T-Mobile Park.
• The Mariners have failed to cover the run line in nine of their last 10 games as favorites against NL West opponents.
• The Giants have won the first inning in each of their last three games at T-Mobile Park.
• The Mariners have trailed after 3 innings in each of their last five night games.
• The Mariners have trailed after 5 innings in each of their last eight games against National League opponents.

Total Runs Facts

• Each of the Giants’ last five games as underdogs have gone OVER the total runs line.
• Three of the Mariners’ last four games have gone OVER the total runs line.
• There has been no run scored during the first inning in each of the Mariners’ last 11 games.
• There has been at least one run scored in the first inning in seven of the Giants’ last eight games as road underdogs.

Seattle Mariners Player Prop Facts

• Dominic Canzone has hit a home run in three of his last four appearances with the Mariners as home favorites.
• Bryce Miller has recorded six or more strikeouts in each of his last four home appearances.
• Josh Naylor has recorded at least one hit in each of his last 13 appearances in night games against NL West teams that held a losing record.

San Francisco Giants Player Prop Facts

• Rafael Devers has hit a home run in each of his last two appearances at T-Mobile Park against opponents that held a losing record.
• Landen Roupp has recorded a win in four of his last five road appearances against opponents that held a losing record.
• Landen Roupp has recorded six or more strikeouts in four of his last five appearances against opponents that held a losing record.
• Luis Arraez has recorded at least one hit in each of his last 17 appearances in night games against AL teams that held a losing record.
• Luis Arraez ranks 2nd in the league in Hits (119) this season.

Matchup/League Facts

• The Mariners rank 1st in the league for walks allowed this season (242).
• The Mariners rank 1st in the league for home runs allowed this season (90).
• The Giants rank T1st in the league for doubles this season (179).
• The Giants rank 30th in the league for walks this season (240).

Giants vs Mariners Prediction

The Giants are 4-1 in their last 5 meetings against the Mariners but are 1-3 in their last 4 visits in Seattle.

In this Giants vs Mariners Prediction, the Mariners are coming as -160 home favorites. I like the Mariners in this spot with Bryce Miller on the mound, who has been the one of the best home pitchers in baseball with a 0.40 ERA across 22.7 innings pitched at home. On top of that, the Mariners have the 4^th-best bullpen in baseball and a better offense and I don’t trust Landen Roupp for the Giants, especially on the road, where he has a 4.67 ERA. Take the Mariners to win this one at home.