Turkish President Recep Tayyip Erdogan has won tightly-contested presidential polls, the election authority said Monday, overcoming the biggest electoral challenge to his 15-year rule. Turkish voters had for the first time cast ballots for both president and parliament in the snap elections, with Erdogan looking for a first round knockout and an overall majority for his ruling Justice and Development Party (AKP). The stakes were particularly high as the new president will be the first to enjoy enhanced powers, without even a prime minister, under a new constitution agreed in an April 2017 referendum strongly backed by Erdogan but which opponents say grants autocratic powers. Erdogan defeated his nearest rival Muharrem Ince with an "absolute majority" of more than half the vote without needing a second round, said the chief of Turkeys election authority, Sadi Guven. "I have been entrusted by the nation with the task and duties of the presidency," Erdogan said in a victory address at his Istanbul residence, vowing that the new presidential system would be implemented "rapidly". "Turkey has given a lesson in democracy to the entire world," he added, pointing to an 88 percent turnout. Erdogan won 52.5 percent in the presidential poll while Ince, of the secular Republican Peoples Party (CHP), was on 31.5 percent, state-run Anadolu news agency said, based on a 99 percent vote count. If confirmed, the figures would show Erdogan polling on a similar rating or even stronger than his 2014 election victory where he won his first mandate after over a decade as prime minister. Trailing were Selahattin Demirtas of the pro-Kurdish Peoples Democratic Party (HDP) with over eight percent in third and Meral Aksener of the nationalist (Iyi) Good Party with over seven percent. Erdogan also declared victory in the parliamentary election saying that the alliance led by the AKP and the Nationalist Movement Party (MHP) had won the majority in parliament. A count of 99 percent of the votes showed that Erdogans AKP and the MHP would win 293 and 50 seats respectively, enough for an easy majority in the 600-member chamber.