It marked the second time the two southpaws have tangled but the first as professionals, with Oubaali winning a flyweight division contest at the 2012 London Olympics.
Oubaali captured the WBC title that became available after Luis Nery failed to make weight for a fight last year.
Oubaali showcased perfect boxing skills on Saturday, combining solid punching power with artful defence.
Oubaali's best round was seventh when he staggered Warren by landing a left-right combination as the two traded heavy blows in centre of the ring.
His defence was also superior as he took a few jabs to the face but managed to easily slip almost all of Warren's big shots.
Like Oubaali, Warren was a decorated amateur boxer and holds the US record of appearing in three straight Olympics.
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