How to Watch Mariners vs Reds: Live Stream MLB Spring Training, TV Channel

The Seattle Mariners face the Cincinnati Reds in this MLB Cactus League Spring Training matchup on Sunday in Arizona.

Mariners open spring training with a win — and a loss in first automated ball-strike challenge

The technology for tracking balls and strikes and challenging the human umpires behind home plate is making its Major League Baseball debut this season.

Mariners' No. 5 prospect opens eyes with power display in spring training debut

Seattle Mariners infield prospect Michael Arroyo put on a show in his first spring training game of 2026, hitting a home run and double.

Mariners bit by ‘couple of sun balls’ in spring-training loss to Giants

The Mariners jumped out to a 5-0 lead in the first inning, but wouldn't score again as the Giants' rally was aided by the cloudless day.

How to Watch Giants vs Mariners: Live Stream MLB Spring Training, TV Channel

The San Francisco Giants face the Seattle Mariners in this MLB Cactus League Spring Training matchup on Saturday.

The spotlight belonged to Mariners prospect Michael Arroyo to start Spring Training

He may be considered a long-shot to make the MLB roster, but Mariners infielder Michael Arroyo displayed why he's going to be a contributor in Seattle very soon
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The hot prospects and new additions to watch at Mariners camp

The lid has been lifted, and the Mariners are off and running in Cactus League play. Seattle opened its 31-game Spring Training slate on Friday against the Padres, their neighbors at the Peoria Sports Complex.