Former Top 3 stars Stan Wawrinka and Dominic Thiem could meet in the second round at the Astana Open, where top seed Tallon Griekspoor leads the field. The Swiss Wawrinka is the eighth seed at the ATP 250 hard-court event and opens against American Marcos Giron. If he advances, he could play debutant Thiem in the second round if the Austrian can overcome Juan Pablo Varillas. Wawrinka and Thiem have not met since 2017, when the former triumphed i…