Sir Alex Ferguson retained the family bragging rights as a goal either side of half-time gave the Premier League and Champions League holders a 2-0 win over son Darren´s ambitious Peterborough.
United started slowly and needed an own goal from Posh right-back Russell Martin to break the deadlock just before half-time.
Tomasz Kuszczak was required to make several excellent saves to keep Posh out before substitute Darron Gibson smashed home an excellent second.
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