Arsenal and Manchester United are the two most decorated, most successful teams in FA Cup history.
The Gunners have won the most FA Cups (13) of any team, the Reds, the second most (12).
Both have appeared in 20 finals.
The Gunners beat United in the 1978-79 final and the 2004-05 final.
Arsenal has eliminated Manchester United from the competition seven times while Manchester United has eliminated Arsenal from the competition seven times.
Friday will be latest chapter in the storied rivalry, albeit with some new faces.
Tomorrow’s match at the Emirates will be the first time since 1983 that this FA Cup fixture will not have at least one of Arsene Wenger or Sir Alex Ferguson on the sidelines
New Manchester United manager Ole Gunnar Solskjær has snapped the Reds out of their Jose Mourinho doldrums.
They have yet to lose with Solskjær at the helm (7-0) and have scored 19 while conceding only five.
United may be without the services of Marcus Rashford, who left their last match with a knee problem, and likely will also be missing Chris Smalling. Marouane Fellaini and Marcos Rojo are both definitely out.
Alexis Sanchez has returned from an extended layoff due to a hamstring injury and is expected to start.
Dinos Mavropanos is available for Arsenal for the first time since September and may feature should Unai Emery decide to rest any of his centre-backs.
Henrikh Mkhitaryan has returned to training following his fractured metatarsal but is not yet match-fit.
Hector Bellerin tore his ACL over the weekend and is out for the season.