The Seattle Mariners open NBC and Peacock’s Sunday Night Baseball on Sunday, March 29, 2026, hosting the Cleveland Guardians at T‑Mobile Park. The nationally televised matchup matters beyond one game: it kicks off a new prime-time showcase and offers a peek at two division winners rematching after deep 2025 playoff runs.

How to watch

When: Sunday, March 29, 2026. Where: T‑Mobile Park, Seattle. TV: NBC. Live stream: Peacock. Start time: 7 p.m. ET (7:20 p.m. first pitch ET).

Broadcast team

Jason Benetti will call the play-by-play with analysts Rick Manning and Ryan Rowland-Smith, while Ahmed Fareed handles the pregame show.

Who’s on the mound and key players

Cleveland sends Slade Cecconi to the hill, while Emerson Hancock starts for Seattle. On the offensive side, the matchup features seven-time All-Star José Ramírez for the Guardians and last year’s MLB home-run leader, Cal Raleigh, for the Mariners.

Storylines to watch

  • Brothers on opposing teams: Cleveland catcher Bo Naylor will face his older brother, Josh Naylor, who plays first base for Seattle — a personal subplot with pro pedigree dating back to their shared time in Mississauga and with Cleveland.
  • Mariners’ power: Cal Raleigh’s 60-homer season remains a major talking point for Seattle’s offense heading into 2026.
  • Guardians’ resilience: Cleveland’s late-season surge in 2025 and the presence of José Ramírez keep them a threat early in the season.

Why this game matters now

NBC and Peacock are expanding prime-time MLB coverage in 2026, with 27 prime-time games across NBC platforms and a daily out-of-market stream on Peacock. Sunday’s game doubles as the debut of NBC’s Sunday Night Baseball package and sets the tone for the network’s broader national slate, including the Sunday Leadoff series that begins in May and a full-day national showcase on July 5.

Fan and industry reaction

Expect social‑media buzz around the Naylor brothers and Raleigh’s bat, plus commentary on NBC’s national showcase for a title-chasing Mariners club that won the AL West in 2025. Industry reaction has focused on Peacock’s increased out-of-market access and NBC’s expanded prime-time window as another step toward making marquee regular-season matchups more widely available.

What to expect next

Look for midseason schedule highlights: the 18-game MLB Sunday Leadoff runs from May and a special July 5 “Star‑Spangled Sunday” all-day presentation. For viewers, Peacock continues to be the streaming destination for out-of-market games and many NBC-produced broadcasts; sign-up and device compatibility details are available on Peacock’s site.

For Mariners fans looking for today’s game, tune to NBC or log into Peacock at 7 p.m. ET to catch the first pitch and the start of NBC’s new Sunday Night Baseball era.