Aryna Sabalenka will crush Polina Iatcenko and keep her US Open title defense alive. Sabalenka will come in as the WTA World No. 1 and she will carry momentum from a 6-2, 6-4 first-round win over Camila Osorio. Iatcenko will arrive as World No. 160 after a 3 hour 27 minute first-round marathon agai…