The 2026 Major League Baseball season's first Sunday Night Baseball game will feature a compelling matchup between two divisional champions from the previous year: the Cleveland Guardians and the Seattle Mariners. The game is scheduled to take place at T-Mobile Park in Seattle, with first pitch set for 7:20 p.m. Eastern Time.
Looking back at last season, both teams had solid campaigns that saw them clinch their respective divisions, though neither advanced to the World Series. The Cleveland Guardians finished the 2025 season with an 88-74 record, securing the American League Central title. However, their postseason run was cut short when they were eliminated in the Wild Card Round. Meanwhile, the Seattle Mariners posted a 90-72 record, capturing the American League West crown. The Mariners made a deeper playoff run but ultimately fell in a hard-fought seven-game American League Championship Series (ALCS).
Heading into this early-season clash, the Guardians hold a 2-1 record, while the Mariners have started 1-2. Cleveland comes off a tight 6-5 victory over Seattle in extra innings just the day before, showcasing the competitive nature between these two division foes early in the year.
For this Sunday night's pitching matchup, the Mariners will send right-hander Emerson Hancock to the mound. Hancock's 2025 season was a mixed bag, as he posted a 4-5 win-loss record with a 4.90 earned run average (ERA). On the other side, Cleveland will counter with right-hander Slade Cecconi, who finished last year with a 7-7 record and a slightly better 4.30 ERA. Both pitchers will be looking to establish themselves early in the season and help their teams gain momentum.
The Mariners and Guardians faced off six times last season, with Seattle holding the edge by winning four of those contests. This familiarity between the teams adds an extra layer of intrigue to the Sunday night game, as both clubs understand each other's strengths and weaknesses well.
In terms of betting odds, the Mariners enter as the favorites on the money line at -144, meaning a bettor would need to risk $144 to win $100 on Seattle. Conversely, the Guardians are listed as the underdogs at +121, offering a $121 return on a $100 wager if they win outright. The over/under for total runs scored in the game is set at 7.5 runs, reflecting expectations for a moderately high-scoring affair.
SportsLine's advanced computer simulation model, which runs 10,000 simulated versions of each game, has provided detailed insights into this matchup. Last season, the model was highly successful, going 35-29 on top-rated MLB money-line picks and generating nearly 30 units of profit on home run prop bets. Its strong track record makes its analysis a valuable resource for fans and bettors alike.
According to the model's simulations for the Guardians vs. Mariners game, there is a strong likelihood that the total combined runs will go over 7.5. This aligns with Seattle's trend from last year, as the Mariners played in games surpassing the over more frequently than all but one other MLB team. Specifically, Seattle's games went over the total 56.2% of the time in the 2025 regular and postseason combined. That percentage climbed even higher-58.7%-when the Mariners played games outside their division.
Offensively, Cleveland struggled at times during the 2025 season, but an offseason acquisition has already begun to make a difference. Rhys Hoskins, who joined the Guardians this year, made an immediate impact by collecting three hits and reaching base safely five times in his team debut. Hoskins' contributions have helped Cleveland's offense improve, as evidenced by the Guardians scoring in two of the first three matchups against Seattle this season. The model projects a combined run total of approximately 8.9 runs for Sunday's game, reinforcing expectations for an exciting, high-scoring contest.
For fans interested in watching the game, it will be available to stream on Peacock, providing easy access to the Sunday Night Baseball broadcast.
For those considering wagering on the game, new users can take advantage of various sportsbook promotions. DraftKings Sportsbook offers a special sign-up bonus, and FanDuel Sportsbook also has appealing offers for newcomers. These promotions can enhance the betting experience, making it easier and more rewarding for fans to engage with the game.
While the model highlights the over on runs as a strong bet, it also identifies one side of the money line as having clear value. However, the model's full picks and detailed betting advice are available exclusively on SportsLine. Given the model's history of success and its in-depth simulations, consulting its recommendations can provide bettors with an edge when deciding how to wager on the Guardians vs. Mariners game.
In summary, Sunday Night Baseball's opening game of the 2026 MLB season promises an exciting showdown between two division champions with something to prove early in the year. The Cleveland Guardians and Seattle Mariners both enter with solid records and talented rosters, setting the stage for a competitive and potentially high-scoring game. With strong starting pitchers on the mound and key offensive players like Rhys Hoskins making an impact, fans can expect a thrilling contest at T-Mobile Park.
For those interested in betting, the Mariners are favored but the Guardians offer attractive underdog odds, and the over/under total suggests a lively offensive game. SportsLine's advanced model supports betting the over and points to one money-line pick with value, making it a valuable resource for making informed bets. Whether you are a casual fan or a serious bettor, this game is one to watch as the MLB season gets underway.