i have a question

AI is f***ing weird, and so scandalous sometimes.
what do i need to get arcade perfect?
in french the trophy is described like i have to win all races at phantom on each track, with elite AI on a TOURNAMENT!! o_O

but the english description does not mention a tournament, so
can i win them separately?
cause damn, i beated my best time, but there was always a piranha or a EG-X at first place, which can arrive with a time that could be ranked under #100
and i could win even being slower (got Elite legend)

so? hope it's not a tournament, i can't have 100% success over AI...