The Wigan Athletic manager was unhappy with referee Michael Oliver's performance in the game, and claimed that Danny Welbeck dived to win his penalty and that the United striker should also have been sent off for a challenge on Franco di Santo.
In his post-match interview, Martinez said: "I have come to United three times before today and for whatever reason we don't seem to be measured in the same manner as the team at home. Today the penalty is as bad a decision as you are going to see in the Premier League."
"In many ways, you feel as though you are fighting against a mountain. There were tackles flying around that if they had been the other way round there would have been a couple of red cards."