▁to ▁a ▁leg ▁injury . ▁ ▁Ke ys ▁won ▁less ▁than ▁half ▁of ▁her ▁matches ▁the ▁remainder ▁of ▁the ▁season . ▁One ▁of ▁her ▁best ▁results ▁came ▁at ▁the ▁C inc inn ati ▁Open , ▁where ▁she ▁beat ▁an ▁in - form ▁Cor net , ▁before ▁pushing ▁No . ▁ 6 ▁Maria ▁Sh ar ap ova ▁to ▁three ▁sets ▁in ▁the ▁second ▁round . ▁At ▁the ▁US ▁Open , ▁Ke ys ▁was ▁seed ed ▁for ▁the ▁first ▁time ▁at ▁a ▁major ▁at ▁No . ▁ 2 7 ▁but ▁suffered ▁a ▁disappoint ing ▁second ▁round ▁loss ▁to ▁qual ifier ▁Aleks andra ▁K run ić . ▁She ▁closed ▁the ▁year ▁by ▁reaching ▁the ▁quarter final s ▁at ▁the ▁Japan ▁Women ' s ▁Open . ▁Ke ys ▁maintained ▁a ▁steady ▁ranking ▁inside ▁the ▁Top ▁ 5 0 ▁throughout ▁the ▁year ▁and ▁finished ▁the ▁season ▁at ▁No . ▁ 3 1 ▁in ▁the ▁world . ▁▁ 2 0 1 5 : ▁Major ▁semif inal , ▁top ▁ 2 0 ▁ ▁In ▁the ▁off - season , ▁Ke ys ▁began ▁working ▁with ▁former ▁world ▁No . ▁ 1 ▁L inds ay ▁D aven port ▁as ▁well ▁as ▁her ▁husband ▁Jon ▁Le ach . ▁With ▁her ▁new ▁co aching ▁team , ▁Ke ys ▁made ▁her ▁break through ▁into ▁the ▁upper ▁e ch el on ▁of ▁women ' s ▁tennis ▁at ▁the ▁Australian ▁Open . ▁She ▁ups et ▁reign ing ▁W im ble don ▁champion ▁and ▁No . ▁ 4 ▁Pet ra ▁K v it ová ▁in ▁straight ▁sets ▁in