M. Joint and Y. Xu will advance over K. Piter and J. Tjen in the WTA Monterrey quarterfinal. The match is scheduled in Monterrey, Mexico at Club Sonoma on Court 4 at Estadio Gnp Seguros and as of August 26 the match had not started. Joint is WTA #41 and Xu is WTA #33, so their win will upend the re…