With the final round of the bid for the 2020 Summer Olympics kicking off, top politicians and athletes vowed Tuesday to win the competition to bring the games to Tokyo.

"The bid is now entering its key stage," Tokyo Gov. Naoki Inose told reporters at City Hall.

On Monday, ambassadors for Tokyo's bid to host the 2020 Olympics, including Homare Sawa, a 2012 Olympics silver medalist soccer player, presented the capital's candidature file to the International Olympic Committee in Switzerland.