Ronaldo equalised from a twice-taken penalty kick after Emmanuel Adebayor had put Arsenal ahead from close range early in the second half, then Hargreaves got the winner after 72 minutes with a superb free-kick from 20 yards.
Ferguson said: "The manner in which Ronaldo took the second penalty kick - it was only about six inches inside the post, low down, no goalkeeper in the world could have saved that. I thought Owen would take the free-kick - he is very good at those ones."
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