It was the next-to-last start for the 24-year-old left-hander before he takes the mound in Sydney, Australia, on March 22 in Arizona's season opener against the Los Angeles Dodgers.
Corbin settled down after giving up two runs in the second, striking out the side in the third before allowing a leadoff triple to Brad Miller in the fourth.
Seattle's James Paxton threw three scoreless innings, running his streak to seven to open the spring, before allowing a run in his fourth and final inning.
The 25-year-old Mariners right-hander gave up a run and five hits, striking out two and walking one.
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