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

Plenty of players will get auditions for the big leagues as the Seattle Mariners hold their 2026 Spring Training camp in Peoria, Arizona, with some notable new

In the bottom of the 4th, newly signed slugger Nick Castellanos dove for a ball and made a very nice play at first base for the Padres.

Seattle Mariners insider Shannon Drayer's first impression at spring training: "It was like I was watching a different team."

The first baseman, who joined the Mariners just before the trade deadline in 2025, said Tucker helps lighten the team's day.

--The Mariners reportedly signed catcher Mitch Garver to a minor league deal on Wednesday and he's expected to be in camp by the end of the week. Garver spent the last two years with the Mariners, hitting 24 home runs. We took a look at the full situation here.

Mariners popular first baseman Josh Naylor has been showing off his Seattle sports jersey collection at spring training. "I want to represent Seattle to the fullest," he said.

As Mariners Spring Training ramps up, pitcher Bryce Miller says he is near 100% after dealing with an elbow injury last season.