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A thing I love about the MLB All-Star Game is that each team gets to send at least one player. Of course, this often means that some of the best players in the league have to stay home to accommodate for whatever Mariner, Marlin, or Oriole is having the best year. But, I counter, who cares?! Every fanbase having the chance to tune in and watch their guy play on the big stage is very cool, and sending a representative from all 30 teams means that fans in say, Arizona, sometimes get to learn about the Pittsburgh Pirates’ third baseman.
In 1988, Harold Reynolds became the first Mariner to represent the team in multiple All-Star Games when he made the AL team for the second consecutive year. Ken Griffey Jr., Edgar Martinez, and Randy Johnson would soon show up and make the team for basically the entire ‘90s, passing the torch to Ichiro and Félix Hernández in the subsequent decades.
There are 23 people in the history of civilization, though, who made an All-Star team as a Seattle Mariner and then never again. To be clear, this excludes people who made the team once as a Mariner but also have ASG appearances with other clubs. For instance, Jean Segura wore the Seattle jersey at the 2018 All-Star Game, the only time he did so for the M’s, but he also was an All-Star with Milwaukee. So he’s out. This list is people who have only ever been an All-Star once, and happened to do so as an employee of the Seattle Mariners baseball club.