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Johnson, 61, went 130-74 with a 3.42 ERA across 10 seasons with the Mariners.
One of the Mariners’ top prospects couldn’t have had his major-league debut scripted any better.
The Sounders’ starters posed for the pregame photo wearing the T-shirts, which also said “Fair Share Now” on the back.
Following an off day, Mariners RHP George Kirby (0-2, 11.42) gets the ball Tuesday to begin a three-game series against Baltimore.
The Bellingham Bells open their season in Nanaimo tonight.
Mariners right-hander Bryan Woo (5-2, 2.69) gets the ball for Seattle to begin a three-game home set against Minnesota.
The Mariners suffered their worst loss of the season as George Kirby continued to struggle coming off his injury.
Gore (2-5, 3.47 ERA) starts Thursday against Mariners RHP Emerson Hancock (2-2, 5.95) to close the three-game series.
A young starter had a career day in the M’s series-opening win last night.
Trevor Williams (2-5, 6.39 ERA) is scheduled to take the mound Wednesday for the Nationals against Seattle’s (George Kirby 0-1, 12.27).