Marcos will begin his BNP Paribas Open campaign on Thursday when he faces German qualifier Daniel Brands.
World No. 74 Brands secured his place in the main draw with a straight-sets win over Rik de Voest on Wednesday. Marcos will play Brands for the second time; he beat the German three years ago on an indoor hard court in Marseille.
The match is scheduled for third on Stadium 2, with play beginning at 11am local time (GMT-8hrs