The pair both live in Arizona and are even members of the same club.
Casey beat fellow Englishman Ross Fisher 2&1 in his semi-final while Ogilvy - the winner of this event in 2006 - despatched American Stewart Cink 4&2.
Cink had earlier in the day defeated Ernie Els 2&1 in the quarter-finals, while Ogilvy had ended the run of 19-year-old Rory McIlroy from Northern Ireland with a 2&1 win.
McIlroy - in his first tournament as a pro in the United States - said: "Geoff played incredibly well but I can take a lot out of this week. I've held my own against some of the best players in the world."
Casey, who overcame American Sean O'Hair 4&3 in his quarter-final, said: "It will be fun to play Geoff - he's a mate."
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