All three bid cities were to have a final chance to woo the IOC members with a 45-minute presentation piece after which the first round of voting would commence.
IOC President Jacques Rogge, presiding over his final IOC Session, got things underway with a brief speech to the 103 members present of which 97 are eligible to vote in the first round - members from the bid cities being ineligible.
Madrid looked to have gained a slight late edge over its two rivals despite Istanbul having put together the best and most dynamic of their five Games bids, and Tokyo being the only one of the three to have hosted the global sporting showpiece previously, in 1964.
However, all three reached the finishing line of the arduous two-year political marathon battered and bruised and with question marks over all of them.
Meanwhile, Tokyo will have to field growing concerns over the leaks of contaminated water from the crippled Fukushima nuclear plant.