Angels vs Mariners Picks and Predictions: Seattle Slugs A Halos Southpaw In Must-Win Game

The Mariners need to win today (and get some help) to play any further baseball in October. The M's have slugged lefties all season and are big MLB betting favorites against a Halos rookie southpaw this season — we see Seattle doing its part to stay alive.

Last Updated: Oct 3, 2021 10:38 AM ET Read Time: 4 min
Mitch Haniger Seattle Mariners MLB
Photo By - USA TODAY Sports

After a 6-4 victory over the Los Angeles Angels on Saturday, the Seattle Mariners are still in the mix for a spot in the AL Wild Card Game.

The Mariners need a win over the Angels — but also to need either the New York Yankees or Boston Red Sox to lose to have a chance of playing beyond today. There's a real possibility of some chaotic tiebreaker scenarios coming to fruition... but Seattle just needs to focus on winning — as a massive MLB betting favorite — to give itself a chance.

This should be the most exciting day of baseball that we’ve had in a very long time, so strap in and make sure you’re ready for it. And here are our Angels vs. Mariners picks and predictions for Sunday, October 3, so you can get in on the action. 

Angels vs Mariners odds

Odds via the Covers Line, an average comprised of odds from multiple sportsbooks.

Compare MLB odds before betting to ensure you get the best number.

Check out the full line movement for this game

Angels vs Mariners picks

Picks made on 10/3/2021 at 10:06 a.m. ET.
Click on each pick to jump to the full analysis.

Best MLB bonuses

If you're signing up for a new sportsbook for some late-season baseball betting, here are two of the best welcome bonuses available:

USA: Ready to hit Dingers? Get up to $2,000 in risk-free bets with PointsBet. Claim Now

Canada: The Betway welcome bonus is a Covers exclusive 100% match on the first deposit — for up to $300 — for free. Claim Now

Angels vs Mariners game info

Location: T-Mobile Park, Seattle, WA
Date: Sunday, October 3, 2021
Time: 3:10 p.m. ET
TV: ROOTNW, Bally Sports West

Angels vs Mariners betting preview

Starting pitchers

Reid Detmers (1-3, 7.11 ERA): Detmers is one of the top prospects in the Los Angeles organization but the lefty hasn’t pitched well in the majors this season. In four starts for the Angels, the 22-year-old has allowed 15 earned runs over 19 innings of work. Also, for a pitcher that has had trouble getting acclimated to the bigs as it is, a playoff-like environment could be a bit overwhelming.

Tyler Anderson (7-10, 4.41 ERA): Anderson faced this Angels team on September 25 and gave up nine earned runs on nine hits in just two innings of work. It was a miserable outing for the lefty and fans are going to be a bit shaky with him on the mound in a must-win game. However, Anderson did bounce back and give up just one earned run over four innings against the Oakland A's in the following start.


Be sure to monitor the gametime conditions with our MLB weather info.

Key injuries

Angels: Justin Upton OF (Out), Mike Trout OF (Out), Anthony Rendon 3B (Out).
Mariners: Shed Long 2B (Out).
Find our latest MLB injury reports.

Betting trend to know

The Mariners are 11-2 in their last 13 games. Find more MLB betting trends for Angels vs. Mariners.

Angels vs Mariners predictions

The Mariners are facing a left-handed starter for the third game in a row, which means they should be very comfortable in the pitch angles they'll see today. Seattle also happens to have 75 homers off of lefties this year, which trails only the Dodgers, so there is a good probability the Mariners could hit a bomb or two, ultimately swinging this game — and the M's season.

On top of Seattle being solid against lefties, the team also gets to face an extremely green one in Detmers. The 22-year-old rookie has allowed at least three runs in three of his four career starts, pitching fewer than six innings in each of those outings. The lefty had also walked nine batters in just 19 innings.

Detmers should have some nerves pitching in front of a raucous (and sold-out) Mariners crowd that will be hungry for playoff baseball, which could lead to some control issues in this one — and Seattle will make him pay. Slugger Mitch Haniger, who snapped a seven-game hit streak Friday night, bounced back by going 4 for 5 with a homer last night and he is batting .287 with 16 homers and 35 RBIs against lefties in 2021. Look for him, as well as Ty France (.313, 9 HR vs. LHP in 2021), to power the offense today.

As for Seattle’s pitching, while Anderson was horrible in his last start against the Angels, it’s worth noting that it was a road game. Anderson is 5-6 with a 5.42 ERA when pitching away from home this season, but he has a 3.11 ERA when pitching in front of his own fans.

Since arriving in Seattle as a midseason acquisition, that hasn’t changed one bit: In four starts at T-Mobile Park, Anderson has allowed only six earned runs over 20 2-3 innings.

This total is extremely low for a matchup between two starters that are likely have some crooked numbers posted against them.

Detmers has only had one good start in the bigs this season and he now faces a motivated Mariners team that has plated at least four runs in 11 of its last 13 games and scored six runs last night. A similar offensive performance against a worse pitcher would mean that the Angels only need two runs in order to help Over bettors cash.

The Over has hit in five of the last six games in which the Mariners have faced a left-handed starter. Also, the Over is 8-3 in Seattle’s last 11 home games.

MLB parlays

Did you know that if you parlayed today’s MLB Angels vs. Mariners picks, you could win $21.01 on a $10 bet?

Use our MLB parlay calculator to create your own parlays and see their potential payouts.

Where can I bet on MLB odds?

You can bet on MLB odds at every online and casino sportsbook, including MLB moneylines, runlines, Over/Under totals, and a ton of MLB prop odds. Head over to our best-suggested sportsbooks for the top spots to bet on MLB odds in your area.

Pages related to this topic

Popular Content

Legal Canadian sports betting

Best Canadian betting sites Ontario sports betting
Covers 25 Years Logo Established in 1995,
Covers is the world
leader in sports
betting information.
Covers is verified safe by: Evalon Logo GPWA Logo GDPR Logo GeoTrust Logo Evalon Logo