Speaking to reporters in Ankara, Yener said Erdoğan won Türkiye's presidency over opposition challenger Kemal Kılıçdaroğlu in the second-round runoff vote.
According to unofficial results, the Turkish incumbent won the race with 52.14%, while Kılıçdaroğlu got 47.86% of the vote, he said. He added that 99.43% of the ballot boxes have been opened so far.
In the first round of the election on May 14, no candidate got the 50% needed for an outright victory, triggering the presidential runoff, though Erdoğan took the lead with 49.52%.
Parliamentary elections were also held that day, with Erdoğan's electoral alliance winning a majority of seats.
"In one of the most important elections of our multi-party political history, our nation made its decision in favor of the 'Century of Türkiye,'" said Erdoğan.
"In the first round of the elections, our nation had already demonstrated its legislative preference by giving the majority of the members of the Turkish Grand National Assembly to the People's Alliance."
The president also thanked each and every member of the nation who gave him the responsibility to govern the country for the next five years.
"I would like to thank all of my citizens who stood up for their will and proved the strength of our democracy by going to the polls at home and abroad, regardless of which party or candidate they chose on May 14 or May 28," he said.
Erdoğan vowed to devote all his time and energy to work, serving the country.
"Healing the wounds of the Feb. 6 earthquakes, the disaster of the century, and restoring our demolished cities will continue to be at the top of our priorities," he added.
Turning to the economy, he said addressing problems caused by inflation is the "most urgent" priority.
"We will continue with confidence and stability. We are planning a production-based economy focused on internationally-reputed financial management, investment and employment," he added.
Erdoğan also promised to implement a system that will reduce input prices in agriculture and livestock, increase producer income, and facilitate consumer access.
On the voluntary return of Syrian refugees, Erdoğan said: "So far, we have facilitated the voluntary return of nearly 600,000 people to safe areas on Syrian territory.
"Through a new resettlement project we are carrying out with Qatar, we will ensure the return of 1 million more people in a few years."
More than 3.7 million Syrians currently reside in Türkiye, making it the world's top refugee-hosting country.
Following the start of a civil war in Syria in 2011, Türkiye adopted an "open-door" policy for Syrians fleeing persecution and brutality.
Syria has been embroiled in a vicious civil war since early 2011, when the Bashar al-Assad regime cracked down on pro-democracy protests with unexpected ferocity.
Hundreds of thousands of people have been killed and more than 10 million others displaced, according to UN estimates.
Meanwhile, at the presidential complex, Erdoğan's supporters celebrated his election victory by singing songs written for the president.
