In the eighth, Boston Smith hit a one-out single off Brady Frederick (8-2) and Arnold hit the next pitch over the wall in left-center field to cap the scoring.
Gus Gregory hit a solo shot in the first, Smith led off the second with another homer off ETSU starter Michael Harpster and Will Cook's two-run double made it 4-0.
Jamie Palmese hit a two-out, three-run home run in the fourth and JD Yakubinis and Cody Miller led off the fifth with back-to-back homers that gave ETSU a 5-4 lead.
Patrick Fultz tied it with a two-out solo shot for Wright State in the seventh.
The Buccaneers (41-17) set a program record with 121 home runs this season — the third most in Southern Conference history — and shattered the previous record for home runs in a season of 93, set in 2010. ETSU finished with the second most victories in program history. The Bucs won 44 games in 1981.
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