Arsenal travel to Manchester United this weekend for the teams' first meaningful encounter in nearly five years.
United are eight points adrift of Arsène Wenger's Premier League leaders and defeat could effectively dash their chances of a second successive title under two different managers.
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David Moyes said earlier this season he was "getting to know" his players, but should have no issues remembering United and Arsenal's intense rivalry. For seven years, Wenger and Sir Alex Ferguson's teams were the best in the country and even the rare 0-0s were controversial.