Leyton Orient 1-0 Walsall
Dean Cox's first-half goal fired Leyton Orient into the third round of the FA Cup at the expense of Walsall.
Despite Walsall starting the better in the first half, Cox's close-range strike put the hosts ahead just before the break.
The visitors' best opportunity for an equaliser came when Craig Westcarr's long-range effort hit the post.
Orient captain David Mooney was shown a straight red card in added-time after clashing with Paul Downing.