<prompt> Williams akatanga mwaka wa2015 nokumiririra United States pamwe chete naJohn Isner paHopman Cup  <response>: . Vaviri vokuAmerica vakakundwa mufainari nePoland. Pamutambo weAustralian Open, Williams akakunda Maria Sharapova kechi16 akateedzana kuti atore mukombe wake wechitanhatu weAustralia Open uye wechi19 mumutambo weGrand Slam, achikunda mukombe uyu pamutambo wake wechitatu mumutambo wechipiri. Nokukunda uku Williams akapfuura vose, Evert naNavratilova, nokuda kwechipiri mazita akawanda eGrand Slam akakundwa muKuvhura Era. Musoro uyu waivewo mukombe wake wechitanhatu weGrand Slam kubva paakasvitsa makore makumi matatu ekuberekwa, zvitatu kupfuura wechipiri wepedyo kuzviita Margaret Court, Martina Navratilova aine matatu mumwe nemumwe. Ndiye mutambi bedzi munhau akakunda Grand Slam dzose ina kanenge kamwe pashure pokunge asvitsa makore 30. Pakupera kwevhiki kwakatevera, Serena nehanzvadzi yake Venus vakaenda kuBuenos Aires kunotarisana neArgentina mumutambo weWorld Group II weFed Cup. Akatamba uye akakunda mutambo wake wega kurwisa María Irigoyen kubatsira Team USA kukunda 4-1 kukunda Argentina. Williams akazivisa kuti aizokwikwidza kuIndian Wells Masters achipedza makore gumi nemana ekuramba mutambo uyu. Pakudzoka kwake Williams akagamuchira kurumbidzwa kwakasimba kubva kuvanhu vazhinji uye akakunda mutambo wake wokutanga mumaseti akarurama. Akasvika kuma semifinals, kwaaifanira kutarisana nenhamba yechitatu, Simona Halep, kunzvimbo yekupedzisira, asi akamanikidzwa kubvisa nekuda kwekukuvara kwebvi. Nokuda kwekukunda Sabine Lisicki mumakwikwi ekupedzisira eMiami Open, Williams akazova mukadzi wechisere chete muThe Open Era kuti anyore 700 mutambo anokunda mubasa rake. Izvi zvakare zvakaita kuti ave mumwe wevatambi vatatu chete vanoshanda kuti vakunde mazana manomwe kana kupfuura makwikwi mu singles, vamwe vari Roger Federer naRafael Nadal. Mumakwikwi ekupedzisira akakunda Halep kuti afambire mberi kusvika kumagumo ake ekupedzisira pachiitiko ichi kwaakakunda rekodhi yechisere zita uye akawedzera kukunda kwake kukunda kusvika ku21 nekurova Carla Suárez Navarro. 