West Virginia left fielder Rogelio Norris dropped Tommy Joseph's two-out fly ball on the warning track in the sixth inning, and the error led to four unearned runs in the GreenJackets' 4-3 victory.
Two runs scored on the error, and Luke Anders immediately followed with his 13th home run of the season.
"Usually we're always good for a big inning late in the game," GreenJackets starting pitcher Andy Reichard said. "So I knew it was coming. You just have to wait for it."
Norris' error and Anders' two-run blast over the manual scoreboard in left-center field came just in time for Reichard (4-1) to get the win.
The Georgia College & State product used an effective slider and curve more often than usual and struck out seven of the first nine batters he faced. He matched a season high with 10 strikeouts and scattered six hits over six innings.
"Reichard did a good job. He's been a solid guy for us, and he's experienced in this league," GreenJackets manager Dave Machemer said. "I thought all our pitchers were great tonight."
Relievers Jose Valdez and Jose Casilla limited West Virginia to one run over the final three innings. Casilla pitched a perfect ninth for his team-leading 12th save.
The three Augusta pitchers combined to strike out 15 batters.
David Rubenstein hit a solo homer in the fourth inning and Elevys Gonzalez drove in another run in the fifth to give the Power an early 2-0 lead.
Augusta struck in the sixth when Nick Liles and Chris Dominguez singled to set the stage for Norris' inning-extending error.
Zach Foster (5-4) took the loss after giving up the four unearned runs.
West Virginia starter Eliecer Navarro threw five scoreless innings, struck out five, allowed just three hits and left the game with a 2-0 lead but settled for the no-decision.