Tens of thousands of people filled the gigantic outdoor area in the Maltepe district of Istanbul on the Sea of Marmara to hear Davutoglu, who said only the ruling Justice and Development Party (AKP) could be trusted with Turkey's future in the June 7 polls.
"Dear Istanbul are you with us? Are you behind us?" shouted Davutoglu, his voice hoarse from campaigning in over 40 cities.
"On June 7, is there going to be a new Turkey?" he said, as the crowds roared their approval.
Davutoglu, the former foreign minister, became premier and AKP leader when Recep Tayyip Erdogan moved to the presidency in August last year after over a decade as prime minister.
He is under huge pressure to show his political mettle in the polls, the first election battle where the Islamic-rooted AKP has not been led by Erdogan since it first came to power in 2002.
Criticised by some for lacking Erdogan's charisma, Davutoglu arrived in rock star-style fashion, circling the crowds in his helicopter before landing nearby.
Speaking in front of a giant picture of himself under the slogan "Stronger Together", Davutoglu spoke from a long catwalk platform that jutted out from the stage, throwing out flowers.
At the end, loudspeakers blared the election song written for Davutoglu, "Ahmet Hoca" ("Ahmet the Teacher"), in reference to his academic background.
Erdogan had used precisely the same venue for his final major rally before his triumphant August 2014 presidential election.
Opinion polls can vary widely in Turkey, with the latest surveys putting the AKP on anything from 38-47 per cent of the vote.
