<prompt> Qedela umusho olandelayo: UWilliams uqale isizini ka-2015 ngokumela i-United States eceleni kukaJohn Isner eMqhudelwaneni  <response>: Indebe kaHopman. Lo mbhangqwana waseMelika wahlulwa yiPoland. Emqhudelwaneni we-Australian Open uWilliams wanqoba uMaria Sharapova okwesi-16 ngokulandelana ukuze athole isicoco sakhe sesithupha sama-singles e-Australian Open kanye nesicoco sakhe seshumi nesishiyagalolunye se-Grand Slam, wathola isicoco sakhe sesithathu emdlalweni wesibili. Ngalokhu kunqoba, uWilliams wadlula bobabili, u-Evert noNavratilova, ngokuba yisihloko sesibili esiphezulu samaGrand Slam esiwinile ku-Open Era. Le ndondo iphinde yaba yindondo yakhe yesithupha ye-Grand Slam selokhu aqala ukuhlanganisa iminyaka engu-30 yobudala, emithathu ngaphezu kwalena elandelayo uMargaret Court, noMartina Navratilova abathathu ngamunye. Nguye kuphela umdlali emlandweni onqobe wonke ama-Grand Slam amane okungenani kanye ngemuva kokuhlanganisa iminyaka engama-30. Ngempelasonto elandelayo, uSerena nodadewabo uVenus baya eBuenos Aires ukuyobhekana ne-Argentina emdlalweni we-Fed Cup we-World Group II. Udlale futhi wanqoba umdlalo wakhe kuphela ngokumelene noMaría Irigoyen ukusiza iTeam USA ukunqoba i-Argentina ngo-4-1. UWilliams umemezele ukuthi uzoncintisana e-Indian Wells Masters eqeda iminyaka yakhe engu-14 yokunqabela lo mcimbi. Lapho ebuya, uWilliams wathola ihlombe elivela esixukwini futhi wanqoba umdlalo wakhe wokuqala ngamasethi alinganayo. Wafinyelela kuma-semifinals, lapho kwakufanele abhekane no-No. 3, uSimona Halep, ukuze athole indawo ekugcineni, kodwa waphoqeleka ukuba ahoxe ngenxa yokulimala edolweni. Ngenxa yokunqoba uSabine Lisicki kuma-quarterfinal eMiami Open, uWilliams waba ngowesifazane wesishiyagalombili kuphela ku-Open Era ukuqopha ukuwina kwemidlalo engu-700 emsebenzini wakhe. Lokhu futhi kwamenza waba ngomunye wabadlali abathathu abasebenzayo abanqobe imidlalo engama-700 noma ngaphezulu emidlalweni eyodwa, abanye kunguRoger Federer noRafael Nadal. Emidlalweni yama-semi-final wanqoba u-Halep ukuze aqhubekele emdlalweni wakhe weshumi wokugcina lapho athola khona irekhodi lesihloko sesishiyagalombili futhi wandise uchungechunge lwakhe lokuwina lwaba ngu-21 ngokunqoba uCarla Suárez Navarro. 