Boston Red Sox vs Seattle Mariners Prediction, 6/20/2026 MLB Picks, Best Bets & Odds

Game: Boston Red Sox vs Seattle Mariners

Date: Saturday, June 20, 2026

Location: T-Mobile Park in Seattle, WA

TV: MLB.TV

Odds/Point Spread: Boston (+106) Seattle (-128)

T-Mobile Park is the site where the Seattle Mariners (39-37) will try to defeat the Boston Red Sox (29-43) on Saturday. The moneyline on this matchup has Boston at +106 and Seattle is priced at -128. The total comes in at 8.5. The pitchers taking the mound are Connelly Early and Emerson Hancock.

As a unit, the Boston Red Sox are putting up 3.9 runs per game, which has them at 29th in baseball. They have tallied 282 runs scored and have an OBP of .313. The Red Sox have compiled 126 doubles as a team and have hit 61 baseballs out of the park. They have accrued 271 runs batted in as well as 591 hits so far this season, while their team batting average is sitting at .244. Boston has a slugging rate of .382 and have been rung up 593 times, while drawing a walk on 209 occasions.

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They have earned a K/BB ratio of 2.80 and the pitching staff sits with a WHIP of 1.28. Red Sox pitchers have surrendered 80 home runs in addition to 295 runs (6th in MLB). Boston has relinquished 598 hits (8.5 per 9 innings) in addition to 277 earned runs. The Red Sox have a team earned run average of 3.92 on the year (9th in the league), and their staff has rung up 604 batters. They have walked 216 players from the other team and their FIP comes in at 3.99 as a unit on the campaign.

The Red Sox have dispatched 220 relief pitchers to the mound this season. The relief pitchers have inherited 86 base runners for the year and 32.6% of those players crossing the plate. The relievers have a total of 34 holds so far this year (20th in baseball). Red Sox pitchers have entered the contest with runners on base 59 times as well as having 60 appearances in high leverage situations. They have accumulated 15 saves for the year and have blown 6 out of their 21 save opportunities. The Red Sox relief pitchers have earned a save percentage of 71.4% and have entered the game in 56 save situations.

The Red Sox have converted 69.5% of balls in play into outs out of 5,718 innings on the diamond, which has them sitting 22nd in the majors. The Boston Red Sox have accumulated 1,906 putouts thus far, in addition to 605 assists and 34 errors. Their fielding percentage is currently at .987 which has them sitting 15th in baseball, and have earned 44 double plays.

Early (6-7 career win-loss mark) has earned a FIP of 3.48 while going up against 406 batters in the majors. He has surrendered 88 base knocks (8.4 hits per nine innings) with 33 walks. His ERA is 3.53 (37 ER's allowed) and he has a WHIP of 1.283. Early has thrown 94 innings and has accumulated 101 punch outs so far in his MLB career.

The Mariners have a team slugging % of .394 and they are earning 4.21 runs per game (20th in baseball). They have notched 97 doubles, while getting a free base 257 times and earning 320 runs. Seattle has knocked in 96 home runs on the season to go along with 311 RBIs. They have been called out on strikes on 647 occasions (8th in MLB) and are sitting with 596 base hits. The Seattle Mariners have a team OBP of .316 in addition to a batting average of .236 on the campaign.

The Mariners hold a team WHIP of 1.185 with a FIP of 3.62 as a team so far this season. They come in at 18th in baseball as a pitching staff in total hits relinquished with 605. The Seattle pitching staff have surrendered 297 runs on the season while having a team ERA of 3.62 (272 earned runs yielded). Their strikeout to walk ratio comes in at 8.70 (657 strikeouts against 196 bases on balls). They have allowed 74 dingers and they allow 3.95 runs per 9 innings (5th in the league).

Sitting with 74 save situations, the Mariners have compiled 42 holds in addition to 13 blown saves. Seattle has called on relievers to take the mound in 31 save chances and they have earned 18 saves. Seattle relievers hold an inherited score percentage of 20.5% of 78 inherited base runners. Their bullpen pitchers have stepped onto the mound 86 times in high leverage situations and on 58 occasions with base runners. They rank 22nd in baseball with a save rate of 58.1%, and they have sent 230 bullpen pitchers onto the field this year.

The Seattle Mariners have gotten 69 double plays and own a fielding percentage of .988 (11th in baseball). The Mariners have accrued 612 assists, 33 errors and have accumulated 2,028 putouts this season. In 6,084 innings on the field, the Mariners have earned a defensive efficiency of 69.9% (17th in pro baseball).

Thus far in his career, Hancock has surrendered 232 base hits while he has earned 184 punch outs in 241 innings. Hancock (13-12 career win-loss mark) is the owner of a 4.32 ERA and has given up 8.6 hits per 9 innings. He has given up a total of 116 earned runs while holding a WHIP of 1.251 and having a FIP of 4.3. He has a K/BB ratio of 2.63 and he has gone up against 1,013 batters in his pro baseball career.

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

Tony Sink's Pick: Take Boston (+106)

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