Pittsburgh Pa. -- After allowing two goals in the first thirty minutes the Charleston Battery rallied, but came up with the equalizer as they fell to the Pittsburgh Riverhounds, 2-1, on Saturday night at Chartiers Valley Stadium.
Tom Heinemann gave the Battery hope with a second half goal, but Pittsburgh weathered a flurry of late chances to hold on for the win.
The Battery loss combined with the Richmond Kickers 1-0 win in Harrisburg reduces Charleston's lead at the top of the USL-2 standings to just three points with one game remaining.
The winner of the regular season advances directly to the championship game.
The Battery finish the regular season at Charlotte on Saturday.
Charleston could have taken the lead in the 13th minute after Heinemann was hauled down in the box, but Ian Fuller slipped as he took the penalty and scuffed the ball over the crossbar.
Pittsburgh opened the scoring in the 17th minute as midfielder Tommy Gray smashed home a free-kick from 30-yards out.
Riverhounds midfielder Jeremy Deighton made it 2-0 when he scored on a loose ball in front of the Battery's net.
Charleston had several chances to tie with Heinemann and midfielder Rudolph Mayard both seeing efforts from close-range saved.