Tampa Bay Rays vs Seattle Mariners Prediction, 8/9/2026 MLB Picks, Best Bets & Odds

Game: Tampa Bay Rays vs Seattle Mariners

Date: Sunday, August 9, 2026

Location: T-Mobile Park in Seattle, WA

TV: MLB.TV

Odds/Point Spread: Tampa Bay (+125) Seattle (-145)

The Tampa Bay Rays (69-46) are traveling to T-Mobile Park on Sunday where they will take on the Seattle Mariners (56-61). The moneyline on this contest has the Rays at +125 while the Mariners are coming in at -145. The over/under has been set at 8. The starting pitchers will be Ian Seymour and Emerson Hancock.

The Rays have hit 165 doubles as a unit and have smacked 118 balls out of the stadium. Tampa Bay has a slugging % of .403 and have been called out on strikes 827 times, while taking a walk on 378 occasions. As a unit, the Tampa Bay Rays are notching 4.5 runs per game, which puts them at 16th in MLB. They have compiled 487 RBI's and 990 base knocks over the course of the season, while their batting average comes in at .258. They have earned 512 runs while holding a team on-base percentage of .329.

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The Rays have a team earned run average of 3.71 over the course of the season (6th in the league), and the staff has struck out 943 hitters. Rays pitchers have surrendered 142 long balls and 470 runs in total (7th in MLB). Their pitching staff has walked 299 opposing batters and their FIP comes in at 4.05 as a team for the season. Tampa Bay has given up 877 hits (7.7 per 9 innings) and also 423 earned runs. Their strikeout to walk ratio is 3.15 and their pitching staff holds a WHIP of 1.15.

Rays relief pitchers have stepped onto the hill with runners on base 95 times in addition to having 114 appearances in high leverage situations. The relief pitchers have earned 88 holds this season (2nd in baseball). The Rays bullpen have accumulated a save rate of 76.7% and have entered the game in 148 save situations. They have 46 saves this season and have blown 14 of 60 save opportunities. The relievers have inherited 137 runners for the year and 27.7% of them ended up scoring. The Rays have dispatched 366 relievers to the mound this year.

The Rays have turned 72.2% of balls hit into play into outs in their 9,225 innings, ranking them 2nd in baseball. The Tampa Bay Rays have a total of 3,075 putouts for the season, in addition to 906 assists and 67 errors. Their fielding percentage is at .983 which has them sitting 21st in baseball, and have a total of 74 double plays.

Seymour has taken the ball for 141 innings and has tallied 163 K's during his pro baseball career. His ERA is 4.02 (63 earned runs allowed) and he has a career WHIP of 1.148. He has allowed 115 hits (7.3 hits per nine innings) with 47 walks. Seymour (12-6 career mark) is the owner of a FIP of 3.96 and he has faced 590 hitters during his time in the major leagues.

The Seattle Mariners have accounted for an on-base percentage of .309 as well as a team batting average of .229 over the course of the season. They have struck out on 1,000 occasions (12th in baseball) and have totaled 885 hits. Seattle has hit 135 long balls so far this season to go along with 443 runs batted in. The Mariners have a slugging percentage of .375 and they score 3.92 runs per contest (29th in MLB). They have recorded 141 doubles, while taking a walk 384 times as well as scoring 459 runs.

The Seattle pitching staff have allowed 474 runs for the year and come in with a team ERA of 3.81 (437 earned runs surrendered). They have given up 128 home runs and they relinquish 4.13 runs per 9 innings (8th in the league). The Mariners have a team WHIP of 1.198 with a FIP of 3.76 as a unit on the season. Their K/BB ratio comes in at 8.70 (999 strikeouts against 292 free passes). They are sitting at 15th in baseball as a pitching staff in total hits relinquished with 946.

With 105 save situations, the Mariners have 60 holds in addition to 18 blown saves. Seattle has had relief pitchers enter the game in 44 save chances and they have walked away with 26 saves. Seattle bullpen pitchers have an inherited score rate of 31.8% out of 110 inherited runners. Their relievers have come in 116 times in high leverage situations and also on 80 occasions with runners on. They rank 20th in the league holding a save percentage of 59.1%, and they have dispatched 347 relievers onto the field this season.

The Seattle Mariners have turned 99 double plays and have accounted for a fielding rate of .986 (14th in professional baseball). The Mariners have accrued 946 assists, 58 errors and have earned 3,100 putouts on the campaign. In their 9,300 innings played, the Mariners are sitting with a defensive efficiency of 69.7% (17th in pro baseball).

So far in his pro baseball career, Hancock has allowed 264 hits while he has totaled 217 strikeouts in 278 frames. Hancock (14-15 win-loss mark in his career) holds a 4.20 ERA while allowing 8.5 hits per 9 innings. He has allowed a total of 130 ER's while earning a WHIP of 1.243 and a FIP of 4.1. He has a K/BB ratio of 2.65 and he has faced 1,165 hitters so far in his career.

Who will win tonight's MLB game against the spread or moneyline?

Guy Bruhn's Pick: Take Seattle (-145)

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