7 th - you ng est ▁player ▁ever ▁to ▁win ▁a ▁W TA ▁tour - level ▁match ▁and ▁the ▁young est ▁since ▁Mart ina ▁H ing is ▁in ▁ 1 9 9 4 . ▁Top ▁seed ▁Nad ia ▁Pet ro va ▁knock ed ▁Ke ys ▁out ▁of ▁the ▁tournament ▁in ▁the ▁next ▁round . ▁Due ▁to ▁the ▁tour ' s ▁age ▁restriction ▁policy , ▁she ▁was ▁unable ▁to ▁enter ▁another ▁W TA ▁tournament ▁that ▁year . ▁Non eth eless , ▁Ke ys ▁found ▁another ▁opportunity ▁to ▁play ▁against ▁the ▁top ▁pros ▁by ▁particip ating ▁in ▁the ▁World ▁Team T ennis ▁league ▁as ▁a ▁member ▁of ▁the ▁Philadelphia ▁Fre ed oms . ▁Still ▁only ▁ 1 4 ▁years ▁old , ▁she ▁beat ▁Ser ena ▁Williams ▁in ▁a ▁set ▁to ▁five ▁games . ▁Williams ▁was ▁ranked ▁No . ▁ 2 ▁in ▁the ▁world ▁at ▁the ▁time ▁and ▁had ▁just ▁won ▁W im ble don ▁earlier ▁that ▁month . ▁ ▁During ▁her ▁early ▁years , ▁Ke ys ▁played ▁mostly ▁on ▁the ▁I TF ▁Circ uit , ▁where ▁she ▁won ▁three ▁titles ▁in ▁singles ▁and ▁one ▁in ▁doubles . ▁Her ▁next ▁opportunity ▁to ▁play ▁on ▁the ▁W TA ▁Tour ▁came ▁in ▁March ▁ 2 0 1 1 , ▁when ▁she ▁was ▁awarded ▁a ▁wild ▁card ▁into ▁the ▁Miami ▁Open . ▁Ke ys ▁was ▁defeated ▁by ▁No . ▁ 4 1 ▁Pat ty ▁Sch ny der ▁in ▁the ▁first ▁round , ▁despite ▁having ▁a ▁chance ▁to ▁serve ▁for ▁the ▁match . ▁Several ▁months ▁later , ▁Ke ys ▁won