The 21-year-old lefty fanned a career-high 12 batters over seven one-hit innings as the host Elizabethton Twins beat the Greeneville Astros, 6-1, on Thursday.

Osterbrock (3-2), who was selected in the seventh round by the Minnesota Twins out of the University of Cincinnati in last month's First-Year Player Draft, issued two walks to go along with his dozen strikeouts. He lowered his ERA to 3.12.

"Pretty much everything was working for me -- fastball, slider, change," he said. "I was locating my pitches and keeping them low."

Osterbrock has 50 strikeouts in 40 1/3 innings this season. In his previous outing, he fanned 10 over six innings in a 4-3 loss to the Pulaski Mariners. But the recent rash of strikeouts apparently can't be attributed to a change in his style.

"I haven't changed anything since college," he said. "A lot of the guys up here are first-pitch fastball hitters, so I've tried to start with offspeed pitches to keep them off balance.

"One of the things I've learned is that having a change is pretty important because most guys like to hit the fastball," Osterbrock added.

He hurled a three-hit complete game July 5 in a 6-3 win over the Bristol Sox. But he noted it wasn't a guarantee of continued success.

"I went out after that game and had back-to-back losses," Osterbrock said. "A game like tonight is definitely a confidence-builder, but you've got to come out the next game and just keep plugging away."

The only hit he surrendered Thursday was a third-inning single by Jorge De Leon.

The Twins (20-14) racked up 14 strikeouts overall. Relievers Steven Blevins and Mark Hamburger, who tossed one inning apiece, each fanned one.

Elizabethton broke open a scoreless game with five runs in the sixth. Jonathan Waltenbury smacked an RBI triple, Michael Harrington had a run-scoring double and Jeff Lanning plated a run with a single in the rally.

Henry Villar (1-3) allowed three runs on six hits, fanning seven without a walk over 5 1/3 innings to take the loss for the Astros (18-18).

Greeneville's only other hit of the night was Ebert Rosario's RBI single in the ninth.