FREDERICK, MD., JULY 25 -- Peninsula's Jeff Nelson pitched a four-hitter to defeat the Frederick Keys, 4-0, tonight at Harry Grove Stadium.

Needing a win to even their record at 14-14 in the season's second half, the first-half champion Keys combined a costly fielding error with a meager offense as their three-game winning streak was ended.

Nelson (1-1) pitched through his only difficulty in the third inning and sailed the rest of the way, recording seven strikeouts and his first complete game of the year.

The Keys dug a four-run hole in the second with two out. Lash Bailey walked and Brett Boone followed with a single to center off Pat Leinen (3-3). Jimmy Campanis's sacrifice fly moved Bailey to third and, following a strikeout of Lem Pilkinton, Leinen appeared as if he might escape the jam.

But following a walk to No. 8 hitter Damon Saetre that loaded the bases, third baseman Tim Holland threw wildly to first on a ground ball that might have been better off held. His off-balance throw on Jorge Robles' weak grounder allowed all three runners to score. After Robles took third on the error, he scored on Jesus Tavarez's single to right.

Nelson, a 6-foot-8 right-hander, pitched himself into a one-out bases-loaded jam in the third, allowing two walks and Tony Beasley's single to center. But Tyrone Kingwood grounded into a double play on the first pitch to end the threat.