on owo , ▁within ▁By dg osz cz ▁County , ▁K uy av ian - P omer an ian ▁Vo iv odes hip , ▁in ▁north - central ▁Poland . ▁It ▁lies ▁ ▁west ▁of ▁Kor on owo ▁and ▁ ▁north - west ▁of ▁By dg osz cz . ▁ ▁References ▁ ▁Category : V ill ages ▁in ▁By dg osz cz ▁County <0x0A> </s> ▁The ▁ 2 0 1 1 ▁ATP ▁World ▁Tour ▁Final s ▁( also ▁known ▁as ▁the ▁ 2 0 1 1 ▁Bar cl ays ▁ATP ▁World ▁Tour ▁Final s ▁for ▁spons or ship ▁reasons ) ▁was ▁a ▁tennis ▁tournament ▁that ▁was ▁played ▁at ▁the ▁O 2 ▁Arena ▁in ▁London , ▁United ▁Kingdom ▁between ▁ 2 0 ▁and ▁ 2 7 ▁November ▁ 2 0 1 1 . ▁The ▁def ending ▁champion ▁in ▁singles ▁was ▁world ▁no . ▁ 4 ▁Roger ▁Feder er , ▁while ▁the ▁def ending ▁champions ▁in ▁doubles ▁were ▁Daniel ▁N est or ▁and ▁N en ad ▁Z imon ji ć . ▁However , ▁they ▁did ▁not ▁defend ▁their ▁title ▁together ▁because ▁they ▁separated ▁after ▁the ▁ 2 0 1 0 ▁event . ▁Z imon j ic ▁formed ▁a ▁team ▁with ▁Mich a ël ▁L l od ra ▁for ▁the ▁season , ▁and ▁N est or ▁partner ed ▁with ▁Max ▁Mir ny i . ▁Feder er ▁successfully ▁def ended ▁his ▁crown , ▁winning ▁an ▁un pre ced ented ▁sixth ▁title , ▁while ▁N est or ▁and ▁Mir ny i ▁captured ▁the ▁doubles ▁title . ▁ ▁Tournament