Kevin Lisbie struck the only goal of a scrappy affair at Brisbane Road to give Leyton Orient a 1-0 win against Rotherham that maintains their position at the top of the table.
Leading striker Lisbie took is tally to 12 for the season when he pounced in the 27th minute to give the home side a deserved lead.
Midfielder Cox had two attempts at trying to force the pass from Moses Odubajo over the goalline, but on each occasion, was denied goalkeeper Adam Collin, who twice parried the ball, only for Lisbie to pounce on the loose ball and power it home from close range.
The Millers improved after the break although they were seldom able to test home goalkeeper Jamie Jones and it was his opposite number Collin that was forced to make three outstanding saves late on from Odubajo, Gary Sawyer and Cox to keep his side in with a chance and ensure a tense finish.
But the O's hung on to deliver the perfect response following their first league defeat of the season in midweek at Coventry.