Desmond Lynam introduces highlights from three of today's key matches from the FA Cup third round and a roundup of the best of the rest. This stage often provides an opportunity for obscure non-league names to become overnight sensations, and it is the time when the clubs with the big reputations have to guard against embarrassing results. Champions Arsenal face an awkward tie at last season's 92nd-placed club Wrexham. And with non-league teams like Crawley and Woking, who reached the fourth round last year, still in the main draw there is much opportunity for upset and glory. Commentary by John Motson, Barry Davies and Tony Gubba.