FREDERICK, MD., JULY 9 -- An unearned run in the second inning provided all the scoring Winston-Salem needed to complete a three-game sweep of Frederick, with a 1-0 victory before a crowd of 2,284 at Harry Grove Stadium tonight.

Marcos Lopez halted the Keys on a three-hitter.

Frederick starter Jeff Bumgarner breezed past the first five Winston-Salem batters, using a powerful fastball and a knee-jerking curve to strike out four, including all three batters in the first.

But in the second, Bumgarner, who had 10 strikeouts in the game, bobbled Doug Welch's potential inning-ending grounder. Kevin Roberson followed with a double into the gap in left-center to score the run.

The loss "was nobody's fault but my own," Bumgarner said. "I feel like Bill Buckner. A baby girl could have fielded that ball, but I was thinking so much about taking it slow that I didn't make the play."

Bumgarner did not allow a Winston-Salem batter past second base the rest of the game. But Lopez dominated the Keys, allowing just five balls to leave the infield and only one runner to advance to second base during his three-hit, no-walk complete game.

Lopez was aided by several excellent defensive plays by third baseman Gary Scott, who had five assists and a putout in the first three innings, and second baseman Paul Blair.

The win raised Lopez's record to 2-0, and dropped his ERA to 0.35 since he was sent down from Class AA. Bumgarner fell to 5-5 with the loss, Frederick's fourth straight.

Winston-Salem raised its league-leading record to 14-4, while Frederick fell to 7-11 in the second half of the Carolina League season.