3x #USOpen champion & 🌎 no. 1 @rafaelnadal is playing his first day session of the 2018 tournament. The 🇪🇸 is facing Karen Khachanov for the 5th time. Send your predictions on who’s going advancing to the R16. Watch now on @ESPN! 🎥 @skinnywashere __ #atp #tennis #rafaelnadal #vamosrafa #instatennis #instaspain #instasports #usopen50 #rafa