Bryan Armetta offers up a preview, prediction and pick for Saturday’s MLB game between the Cleveland Guardians and Seattle Mariners.

After falling just short of an American League pennant, the Mariners come into this season with World Series expectations. That means taking care of business against potential postseason foes. The Guardians, despite constant budget limitations, should hang around in the Junior Circuit. Winning a road series against a title contender would make for quite the statement from Cleveland.

The Mariners are favorites (-194) over the Guardians, with the over/under set at seven runs. Below, I’ve laid out my preview, prediction, and best bet for Saturday’s showdown between Cleveland and Seattle on DraftKings Sportsbook.

Guardians vs. Mariners prediction, preview

Toeing the slab for Seattle tonight will be Bryan Woo. The right-hander was one of the best pitchers in the game last season, emerging as a bonafide ace. Through 186.2 innings of work, he notched a 2.94 ERA, 0.93 WHIP and 198 strikeouts. A master of command, the All-Star is one of the sport’s most consistent arms. It helps that he gets to toss half of his games at spacious T-Mobile Park, arguably the most pitcher-friendly venue in baseball. Regardless, Woo’s stuff can dominate from just about anywhere.

That’s bad news for any team, let alone a lackluster Cleveland lineup. Last season, the Guardians posted a .679 OPS against right-handed pitching, third-worst in the majors. Since 2025, just four players on their active roster have recorded a wRC+ above 110 against righties. Outside of franchise cornerstone Jose Ramirez, there aren’t many names that strike fear into the opposition.

With that being said, a Cleveland rookie might be the biggest x-factor going into tonight’s contest. Chase DeLauter has been on an absolute tear, launching three homers during his first two career games. The big lefty adds a new component to an otherwise light-hitting Guardians squad. While his recent production is unsustainable, the 24-year-old already looks like a legitimate middle of the order bat.

Joey Cantillo will get the nod for Cleveland, a young arm that the organization is high on. Last season, he delivered a 3.69 ERA, 1.27 WHIP and 10.2 K/9 ratio over 134.0 innings as both a starter and reliever. Impressive swing and miss stuff makes the 26-year-old a name to watch going forward. The southpaw’s 29.7% whiff rate ranked inside the league’s 80th percentile, per Savant. He allowed two runs or fewer in nine of 13 appearances last season as a starter.

Seattle certainly isn’t lacking in the run scoring department. This lineup, led by MVP runner-up Cal Raleigh, averaged the tenth-most runs per game in baseball last year (4.68). However, the Mariners put up the league’s 13th-fewest runs per game at home (4.28). As previously mentioned, scoring at T-Mobile Park can be laborious. The M’s ranked just 18th in batting average against left-handed pitching (.241). Newly acquired leadoff hitter Brendan Donovan helps Seattle, but he also makes them even more dependent on left-handed hitters. On paper, that plays to Cantillo’s advantage.

Guardians vs. Mariners pick, best bet

Woo is an absolute stud, and it wouldn’t be a shock if he took over tonight. With that being said, Cantillo is no slouch either. Cleveland’s underrated hurler has the potential to become a key piece in this Guardians rotation. In a battle between two talented young arms, don’t expect much scoring on Saturday night.

Best Bet: Guardians vs. Mariners first five innings under 3.5 total runs (-105)