Start honing your running, throwing and catching skills for the coolest summer job in sports. The 2017 #USOpen ballperson tryouts are going down at Billie Jean National Tennis Center on Monday, June 26. Hundreds will try out, approximately 80 will make the cut. 📹: Mardy Fish vs Ivo Karlovic - 2005 _ #fbf #tennis #ballgirl #ballboy #instasport #flashback #mardyfish #ivokarlovic #ballperson #flashbackfriday