▁first ▁major ▁of ▁the ▁year , ▁Ke ys ▁defeated ▁No . ▁ 8 ▁Caroline ▁Gar cia ▁to ▁reach ▁the ▁quarter final s ▁of ▁the ▁Australian ▁Open ▁for ▁the ▁second ▁time . ▁In ▁this ▁round , ▁she ▁lost ▁to ▁Angel ique ▁Ker ber , ▁one ▁of ▁her ▁most ▁difficult ▁oppon ents . ▁Out side ▁of ▁the ▁Australian ▁Open , ▁Ke ys ▁won ▁just ▁one ▁match ▁in ▁the ▁first ▁three ▁months ▁of ▁the ▁year . ▁She ▁ended ▁the ▁early - year ▁hard ▁court ▁season ▁with ▁a ▁ret irement ▁due ▁to ▁a ▁left ▁th igh ▁injury ▁against ▁Victoria ▁Az aren ka ▁at ▁the ▁Miami ▁Open ▁in ▁Az aren ka ' s ▁com eb ack ▁tournament . ▁ ▁In ▁April , ▁Ke ys ▁returned ▁to ▁Fed ▁Cup ▁competition ▁in ▁the ▁semif inal ▁against ▁France . ▁She ▁defeated ▁Paul ine ▁Par ment ier ▁in ▁her ▁only ▁match ▁to ▁cl inch ▁the ▁tie ▁and ▁put ▁the ▁United ▁States ▁in ▁the ▁final . ▁At ▁the ▁French ▁Open , ▁Ke ys ▁produced ▁the ▁best ▁result ▁of ▁her ▁career ▁at ▁the ▁tournament . ▁She ▁reached ▁the ▁semif inals ▁without ▁dro pping ▁a ▁set ▁to ▁set ▁up ▁a ▁rem atch ▁of ▁the ▁ 2 0 1 7 ▁US ▁Open ▁final ▁with ▁Slo ane ▁Steph ens . ▁This ▁was ▁the ▁first ▁all - American ▁semif inal ▁at ▁the ▁French ▁Open ▁since ▁ 2 0 0 2 . ▁Ke ys ▁again ▁lost ▁to ▁Steph ens ▁in ▁straight ▁sets . ▁She ▁only ▁played ▁one ▁grass ▁court ▁event , ▁losing ▁in ▁the ▁third ▁round ▁at ▁W im