, ▁in ▁which ▁they ▁were ▁the ▁top ▁se eds ▁but ▁lost ▁in ▁the ▁quarter - final s ▁to ▁V ania ▁King ▁and ▁Y ar os lava ▁Sh ved ova , ▁the ▁event ual ▁champions . ▁In ▁the ▁singles , ▁D ul ko ▁reached ▁to ▁the ▁third ▁round ▁before ▁losing ▁to ▁the ▁No . ▁ 2 0 ▁seed , ▁An ast asia ▁Pav ly uch enk ova . ▁ ▁At ▁the ▁China ▁Open ▁in ▁Be ij ing , ▁D ul ko ▁made ▁it ▁to ▁the ▁second ▁round ▁before ▁falling ▁to ▁Maria ▁Kir ilen ko . ▁In ▁the ▁doubles , ▁D ul ko ▁and ▁Pen net ta ▁lost ▁in ▁the ▁final ▁to ▁Ol ga ▁G ov ort so va ▁and ▁Chan ▁Y ung - jan , ▁and ▁then ▁won ▁their ▁sixth ▁event ▁of ▁the ▁season ▁at ▁the ▁Kre ml in ▁Cup ▁in ▁Moscow . ▁D ul ko ▁and ▁Pen net ta ▁were ▁invited ▁to ▁the ▁Tour ▁Championships ▁in ▁D oh a ▁as ▁the ▁top ▁se eds , ▁and ▁defeated ▁P esch ke ▁and ▁S re bot nik ▁in ▁the ▁final ▁to ▁win ▁the ▁year - end ▁championship . ▁ ▁On ▁ 1 ▁November ▁ 2 0 1 0 , ▁D ul ko ▁became ▁the ▁world ▁No . ▁ 1 ▁ranked ▁doubles ▁player . ▁▁ 2 0 1 1 – 2 0 1 2 ▁D ul ko ▁and ▁Pen net ta ▁to ▁won ▁their ▁first ▁Grand ▁S lam ▁event ▁title ▁at ▁the ▁ 2 0 1 1 ▁Australian ▁Open , ▁defe ating ▁Az aren ka ▁and