Ustero/Sánchez arrive as the more established, higher-tempo pair and should control most rallies through sustained net pressure and cleaner transition patterns. Barrera/Velasco’s path is to disrupt rhythm with height, varied speeds, and targeted serving/return games to avoid being pinned in defense. In Cancún’s typically quicker, lively conditions, the edge leans Ustero/Sánchez in straight sets if they keep errors low.