Diego Forlán
The rivalry escalated in September 2003, when Arsenal travelled to Old Trafford. In the match Vieira was shown a second yellow card for his part in an altercation with striker Ruud van Nistelrooy, and during stoppage time, defender Martin Keown brought down Diego Forlán in the Arsenal penalty area. United were awarded a penalty and Van Nistelrooy stepped up to take it, but his shot rebounded off the crossbar.