3/18/16 ITF event SFs set:  Via wtatennis.com: Unseeded American Alison  Riske knocked out top seed Daria Gavrilova to reach the semifinals of the inaugural San Antonion Open.  Anna-Lena Friedsam def. Ana Konjuh in three sets, 6-4, 4-6, 6-2.  Tsvetana Pironkova needing only 51 minutes to dispatch Donna Vekic, 6-1, 6-1. Misaki Doi - the only remaining seed in the draw -  def hot-shot American Samantha Crawford, 6-3, 6-3.