While the number of sports for Tokyo was set at 33 a year ago, many worldwide federations want to tweak their schedules with new events.
Arriving along with five new sports, the shifts represent what IOC President Thomas Bach is calling "a step-change in the Olympic program".
The International Olympic Committee's Executive Board announced on Friday it will include 3-on-3 basketball as part of the Olympic program starting with the Tokyo 2020 Olympic Games.
"In Tokyo, the number of mixed events will double from nine in Rio 2016 to 18".
The IOC on Friday revealed a list of approved events for the Games, which placed a focus on gender balance and a more "youthful" and "urban" approach.
The IOC said the process of changing the Summer Games programme began after Rio, when sports federations were able to review data on the appeal of their sports and specific events, before requesting changes for Tokyo.
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So canoeing is proposing to drop the C2 slalom and two sprint events to find room for three female races, rowing is scrapping the lightweight men's four for an open-weight women's event and shooting wants to swap the men's 50metre rifle prone, 50m pistol and double trap for three mixed team events.
Olympics chiefs have given the go-ahead for mixed relays in 4x400m athletics, 4x100m swimming and the triathlon - a move which is likely to convince Britain's Olympic men's champion Alistair Brownlee to compete in Tokyo. Fencing also gains a team event. A men's 800 and a 4×100 mixed medley relay - another possible event for Ledecky - was also added.
As for the Tokyo 2020 additions, the slimmed-down version of basketball features skeleton teams playing half-court games to 21 with a 10-minute time limit.
This is in addition to the committee's decision to include sports climbing, skateboarding, surfing, baseball, softball and karate in the Tokyo program last August.
The new events will see the introduction of Freestyle BMX and the Madison to the Cycling programme that will make that sport the third largest at the Olympics in terms of medals, with 66 up for grabs.
The biggest cut hit one of the biggest sports: Athletics, which includes track and field, will have 105 fewer athletes in Tokyo.
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