Arsenal emphasised their current superiority over Tottenham with a comfortable FA Cup third round victory at Emirates Stadium. Arsene Wenger has set his sights on an extended FA Cup run as his side stand top of the Premier League table - and they were never in serious danger as they dominated this north London derby to move into the next round. Santi Cazorla's powerful finish put the hosts ahead in the first half and Danny Rose's dreadful error allowed Tomas Rosicky to race half the length of the field to score just after the hour. The only downside for Arsenal was the sight of Theo Walcott being carried off on a stretcher in the closing minutes after appearing to catch his studs in the turf as he raced back to make a defensive tackle.