Royals vs Mariners Prediction, Odds, Picks 5/1

The Seattle Mariners host the Kansas City Royals on Friday, May 1. First pitch from T-Mobile Park is scheduled for 9:45 p.m. ET. The game will be broadcast on Apple TV+.

The Mariners are favored by -142 on the moneyline and by -1.5 on the run line (+158). The Royals are +120 on the moneyline and +1.5 on the run line (-192). The over/under is 7 runs.

Find my Royals vs Mariners predictions for tonight's series opener below.

Royals vs Mariners Predictions, Picks

• Royals vs Mariners Pick: Over 7

My Royals vs Mariners best bet is on game totals. Make sure to find the best odds by checking our live MLB odds page.

Friday, May 1

9:45 p.m. ET

Apple TV+

Royals Odds
Spread	Total	Moneyline
+1.5 -192	7 -110o / -110u	+120

Mariners Odds
Spread	Total	Moneyline
-1.5 +158	7 -110o / -110u	-142

Odds via FanDuel. Get up-to-the-minute MLB odds here.

• Royals vs Mariners moneyline: Royals +120, Mariners -142
• Royals vs Mariners over/under: 7
• Royals vs Mariners spread: Royals +1.5 (-192), Mariners -1.5 (+158)

Royals vs Mariners Preview, Prediction

Royals Preview

Many expected an immediate bounce-back from Cole Ragans, who seemed under the surface to be one of the unluckiest pitchers in baseball last year. He finished with a 2.67 Expected ERA, which was a full two runs lower than his actual ERA, and he also struck out a whopping 38.1% of the batters he faced in a 13-start, injury-shortened season.

Well, things haven't exactly gone according to plan. Ragans is still sporting a solid 28.7% strikeout rate with a similar hard-hit rate, and even his .232 Expected Batting Average isn't all that bad. The issue is twofold; not only is Ragans walking a concerning 15.7% of batters, he's also experiencing a ton of trouble with home runs. That would be due in part to his heavy 20.3% Pull Air% which sits around three and a half points higher than average, and last year he was all the way up at 27%.

Slugging, then, would seem to be the nemesis of Ragans, unlike last year where his .357 BABIP seemed to tell a tale of misfortune. His BABIP has stabilized to .263 this year — which honestly is due to rise around 30 points judging by both Ragans' and the league's averages — but hitters are making the most on contact in slugging .490 off the veteran.

It's not like this is unrecoverable; after all, Ragans has had a few nice outings this year, including his previous one, which saw him strike out 11 Angels, but he did still allow a home run in that contest and will continue to be a liability. His barrel rate was just shy of 10% last year, and he's firmly a fly-ball pitcher.

Mariners Preview

Like Ragans, Bryan Woo is another talented pitcher trying to find a bit of footing this season. His walk rate has remained insanely low at 4.3%, but outside of that there's not a ton that's recognizable about the righty.

Woo has opened up the year with just a 19.1% strikeout rate — something that's a huge deal considering he broke into the league by striking out hitters at a quick pace, and returned to form last year with a 27.1% strikeout clip.

His ballpark helps him out quite a bit as a fly-ball pitcher, though we've seen a steep 10-point drop in ground balls for Woo this year from his 41.4% clip in 2025 — one which was already around three points lower than the league average.

That's always the trouble with Mariners pitchers — on the road, they're going to be susceptible to homers as extreme fly-ball arms — and that's exactly what happened to Woo last start when he allowed four homers in St. Louis. That's not exactly an easy park to hit a homer in, either, and he did allow nine hits — so that's simply a bad start all around.

Even if you want to throw away that start, Woo's Pull Air% is still up five points from last season, and his strikeout numbers are down with lower chase and whiff rates. His fastball velocity is fine, but his whiffs are down on every pitch — with the slider taking the biggest hit. His sinker's xBA continues to climb with every season, too, and the xBA on his fastball is firmly up, but more strikeouts and more home starts are going to be what Woo needs.

Royals vs Mariners Prediction, Betting Analysis

It's certainly early, but T-Mobile Park has continued to move into neutral territory for home runs judging by Park Factor. It was nearly the most average park in 2025, and this year it's actually been slightly above average for homers. It's been shockingly friendly to lefties, and even though it's still a very small sample, in the last two years there's been a clear uptick in homers any way you slice it.

That is going to bring the lift and pull back into the discussion for this game, because both arms are dealing with some issues there, and both teams also lift and pull a bunch. The Mariners are sporting the third-highest Pull Air% in the league, and the Royals are not to far back in 11th place. There's going to be a slight breeze in from left, but the air should be warm enough to make this a factor.

While Seattle hasn't hit lefties all that well, they have walked in 10.5% of plate appearances which is pretty high, and we've covered how Ragans has all sorts of issues right now with control — not to mention slugging. Seattle's running a .183 Isolated Power in the last two weeks, meaning it should have a good shot at touching up Ragans, and with Woo dealing with a Royals offense with an even-better .185 ISO in that time, I think this total is too low.

Pick: Over 7 (-110) | Play to Over 7.5 (-108)

Royals vs Mariners Viewing Info: Channel, Start Time, Streaming