With some 15 results yet to come in, Telangana Rashtra Samiti bagged 60 seats out of the total 119 in the region, which would be born as the country's 29th state on June two.
The victory for TRS meant a loss of face for the Congress which failed to capitalise on its claim of "delivering" statehood for Telangana as it secured a mere 16 seats and was leading in four others.
"I bow my head in humility. I thank the people of Telangana for giving us the victory. We will implement our election manifesto in letter and spirit," Chandrasekhar Rao or KCR, as he is popularly known, told a press conference.
Rao himself won from Gajwel in native Medak district.
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In happy tidings for the family, his son K T Rama Rao emerged victorious in Sircilla and nephew T Harish Rao from Siddipet.
Congress, which was accused by rivals, including YSR Congress Party, of creating Telangana to serve its narrow political interests, suffered major losses.
KCR's decision to go it alone after refusing to merge it with the Congress and even deciding not to have an electoral alliance with it helped his party reap rich dividends.