Blue Jays vs. Mariners games at T-Mobile Park always generate an excellent atmosphere, as thousands of Blue Jays fans will travel south to provide a boost for the road side. This year’s visit carries even more significance, as the clubs meet for the first time since a closely fought ALCS last October and are currently battling for the final Wild Card berth. Including three wins on the road in the ALCS, the Blue Jays went 5-1 in Seattle last season, and our Blue Jays vs. Mariners prediction for Friday’s series opener will target Dylan Cease leading Toronto to an important victory in the series opener.
After a losing selection backing Bo Bichette to Record an RBI on Wednesday, Nick holds a record of -0.31 units across 14 MLB betting predictions this season.
Blue Jays vs Mariners Prediction: Toronto +0.5 F5 Innings/Full Game Moneyline +105 (Play to -105)
Toronto +0.5 F5 Innings/Full Game Moneyline
With Cease set to face off against Luis Castillo, the Blue Jays will begin this game with a considerable pitching advantage, while for a change their top high-leverage relievers enter this matchup well-rested. Seattle’s lineup has not been much more productive than Toronto’s this season, and has been in considerably worse form over the last 30 days.
Efficiency has been a concern for Cease across his first four starts since coming off the IL, but he has still pitched to an ERA of 2.95 while racking up 15.19 strikeouts per nine. He holds an xERA of 2.48 in those outings and an xFIP of 2.63.
While the team would love to see Cease handle seven innings for a change, in this particular matchup a shorter start from Cease would be quite livable as Louis Varland, Tyler Rogers, Mason Fluharty, Adam Macko and Braydon Fisher are all well-rested.
Over the last 30 days, the Mariners rank 26th with a wRC+ of 87, hold a BB/K ratio of 0.35, and rank 21st in hard-hit rate. They’ve been getting by where it counts in that span, but that’s mainly been due to the fact that their pitching staff has worked an ERA of 3.65 in that span.
Castillo does not look overly likely to steal any games right now, as he holds a 4.93 ERA and 4.59 xERA this season. He has trended into better form recently but still owns a 4.10 ERA and 4.28 xFIP throughout his last 48 1/3 IP, which suggests Cease is still a considerably more effective option.
The Blue Jays appear to have a great chance of getting off to a solid start in this matchup, before their top bullpen arms enter the matchup late. At +105, there looks to be value backing the Jays to at least push the first five innings and win the game.
Blue Jays vs Mariners odds
| Blue Jays moneyline odds | -125 |
| Mariners moneyline odds | +105 |
| Run line odds | Blue Jays -1.5 (+140), Mariners +1.5 (-165) |
| Game total | Over 7 runs (-120), Under 7 (+100) |
| Date/time | July 3, 8:10 p.m. ET |
Betting Toronto Blue Jays
The Blue Jays finally managed another blowout win on Canada Day, their first win by more than three runs since July 16th. Hopefully, the lineup can carry some momentum out of the excellent performance, which included two three-run homers and 12 hits, but at worst, the convincing win followed by an off-day offered some much-needed rest for the top bullpen arms.
Varland and Rogers provide one of the better one-two punches in baseball, but have shown slightly more cracks of late due to overuse. Varland holds an absurd 0.98 ERA across 46 innings this season, while Rogers has worked to a 1.82 ERA across 39 2/3 innings. Macko, Nance and Fluharty are also well-rested and provide strong options for the sixth and seventh innings, if needed.
While Cease’s walk rate and struggles to strike batters out have been slightly concerning of late, he has still not been barreled up a single time over his last 300 pitches thrown and has allowed an xBA of .185 throughout his last nine outings.
Toronto’s lineup has struggled mightily versus left-handed pitching recently, but it has hit to a wRC+ of 107 versus righties since June 1st. The Blue Jays’ worst year-over-year regression offensively has come versus breaking stuff, but Castillo features a fastball-heavy arsenal and may struggle to expose what has become Toronto’s greatest weakness.
Betting Seattle Mariners
Playing out of a soft AL West Division, the Mariners enter this series with a 3.5-game lead over Toronto for the final Wild Card berth. They have played to a record of 25-19 at pitcher-friendly T-Mobile Park, where the majority of their starting rotation continues to offer strong results.
To this point, Castillo has not found much success at home, as he holds an ERA of 5.68 and a WHIP of 1.42 across 31 2/3 innings of work. While it’s unlikely that Castillo will actually finish the year with worse splits at home, his overall profile is concerning and he’s certainly far from the pitcher he once was.
Castillo holds a Stuff+ rating of 98, which is tied (with 2025) for the worst mark of his excellent career. He holds a career-low strikeout-minus-walk rate of 13.9% and ranks in the 19th percentile in hard-hit rate and 22nd percentile in barrel-rate this season.
Since June 1st, the Mariners have hit just .230 versus right-handed pitching, and hold a wRC+ of 89. They have struck-out 23.2% of the time in that span, which has made Cease’s strikeout prop a popular bet on Friday’s slate, but the one slight concern towards that prop is that Cease threw 107 pitches last time out and Toronto is not situated to push him too deep into this game.
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