UFC on Fox: Johnson vs. Reis (also known as UFC on Fox 24) was a mixed martial arts event produced by the Ultimate Fighting Championship held on April 15, 2017 at the Sprint Center in Kansas City, Missouri.

The event was the first that the UFC has hosted in the state of Missouri and the Kansas City metropolitan area.

A UFC Flyweight Championship match between current champion Demetrious Johnson and Wilson Reis headlined this event. The pairing was originally booked for UFC 201, but Johnson pulled out due to an undisclosed injury and the bout was scrapped.

UFC officials were initially targeting a featherweight bout between former UFC Bantamweight Champion Renan Barão and Doo Ho Choi to serve as the event headliner. However, as the announcement of the pairing began to circulate, Choi declined the bout, and as a result, Barao is expected to be rescheduled against a different opponent, possibly at another event.

The following fighters were awarded $50,000 bonuses:

With his win, Johnson tied Anderson Silva's record for most consecutive title defenses (10).

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