Jeff Arnold provided the game-winning grounder with the bases loaded in the bottom of the 10th, and Delmarva's pulled-in infield couldn't handle the sharp roller as the GreenJackets claimed an 11-10 walk-off win.
"They keep battling," manager Lipso Nava said. "It only takes one guy to get hot and the others follow, and that's happening right now."
For the second night in a row the GreenJackets (5-9) celebrated a walk-off win with a mass celebration on the infield. They had to overcome a four-error night that saw the home team blow leads of 3-0, 4-3 and 7-6. But the game-winner came when Delmarva shortstop Manny Machado, the Orioles' top draft pick from a year ago, bobbled Arnold's grounder in the 10th and fired home late to score Adam Duvall from third.
Arnold also led off the ninth with a single and later scored the game-tying run to force the extra inning.
"It's been a tough start, and these last two games showed us that when we're up against the wall we can fight out of it as a team," Arnold said. "We know this game is not too fun when you're losing. We're going to be together the next five or six months, and we want to be having fun. The best way to do that is win games."
The late error saved the night for the GreenJackets, but the bats put them in position to win. Augusta posted its third consecutive game of 11 hits or more, which hadn't happened since July 23-25 of last year.
West Virginia starter Jacob Pettit entered the game with two wins and a 0.71 ERA in two previous outings but left with six earned runs to his credit when he was pulled in the fifth. Duvall jumped on Pettit early by extended his hitting streak to eight games with a three-run homer in the first inning.
Raynor Campbell added a 3 for 6 night with a pair of run-scoring doubles. Josh Mazzola tied the game at 6 with a two-RBI double in the fifth.
"It was almost like from the fifth inning on they turned it up a notch," Nava said of his team. "They won't quit. It's like it's in them to win, and they're just now starting to realize it."
The game's nine errors were the most in a GreenJackets game since at least 2008.
Augusta starting pitcher Seth Rosin struck out a career-high six batters in five innings. He gave up six runs, three earned, on seven hits and three walks for a no decision. Edwin Escobar, recently bumped out of the starting rotation, made his first appearance as a reliever and got the win with a perfect 10th inning.
David Walters blew a save opportunity and took the loss for Delmarva.
Shorebirds manager Ryan Minor was ejected during the seventh-inning stretch after arguing a close call at third base.