Leyton Orient 1-2 Northampton
Doig's second-half header ensured that Northampton won
Leyton Orient suffered an FA Cup hangover as they slumped to a sixth home defeat of the season.
Scott McGleish opened the scoring for the visitors against his former club, as he pounced when keeper Glyn Garner failed to hold a shot from Jason Lee.
Garner was later forced off after colliding with Lee and substitute Glenn Morris stood no chance with Chris Doig's header from David Hunt's corner.
Daryl McMahon netted for Orient on 85 minutes, but it was not enough
Given resources Ling seems to have definately stolen the edge on Calderwood but still remains very close between the two sides.