Jenson Brooksby[19] → replaced by Kamil Majchrzak Borna Ćorić → replaced by João Sousa Pablo Cuevas[20] → replaced by Ernesto Escobedo Novak Djokovic[17] → replaced by Salvatore Caruso Roger Federer[21] → replaced by Denis Kudla Ilya Ivashka → replaced by Damir Džumhur Kei Nishikori[22] → replaced by Philipp Kohlschreiber Guido Pella[23] → replaced by Feliciano López Milos Raonic[24] → replaced by Carlos Taberner Casper Ruud → replaced by Roman Safiullin Tennys Sandgren[25] → replaced by Egor Gerasimov Dominic Thiem[26] → replaced by Maxime Cressy Stan Wawrinka[23] → replaced by Sam Querrey