Walker’s heavyweight debut set for UFC 332, drawing ranked British contender Mick Parkin

Johnny Walker is going up in weight, and the UFC has handed him a live one on the way in.

Walker will make his heavyweight debut against Mick Parkin at UFC 332 on October 3 in Utah, per Bloody Elbow’s Brazilian sources. It is the first bout announced for the card.

The booking is a reshuffle from Walker’s original heavyweight debut, which had been scheduled against Ante Delija at UFC Belgrade. Delija was forced out with an injury, and rather than seek a short-notice replacement inside a week, the promotion moved Walker to the October 3 numbered card and paired him with a considerably more credentialed opponent. Parkin, at No. 15 in the UFC heavyweight rankings, is a step up from what Delija would have represented on his own.

The move follows a rough stretch at 205 pounds. Walker has one win in his last five outings, most recently dropping a decision to Dominick Reyes at UFC 327 on April 11, 2026. His professional record now sits at 22-10, 1 NC. He is 33.

The past three years have been the difficult part of his run. The bright striking, the length, and the chaotic finishing sequences that defined his light heavyweight ascent have been progressively harder to convert since 2023. A move to heavyweight is a reset button that fighters at his stage of career reach for when the arithmetic at the current weight class has stopped working. Whether the physical transition holds up is the question the October card will start to answer.

Parkin, 30, has spent his professional career at heavyweight. The Sunderland-based Briton is 10-1, opened his professional career 10-0 across the UK regional scene and Dana White’s Contender Series, and dropped his only professional loss by unanimous decision to Marcin Tybura at UFC Fight Night on March 22, 2025. That is his only defeat. He trains at Team Fish Tank MMA and has been a British heavyweight prospect the promotion has developed patiently since his Contender Series signing in 2022. He and UFC heavyweight champion Tom Aspinall have both come out of the British heavyweight pipeline that has grown considerably deeper over the past five years. Both fighters have been publicly cordial. Whether they train together consistently has not been publicly detailed.

The stylistic questions are the interesting part. Walker built his light heavyweight run on speed, length, and the kind of chaotic striking that tends to reward the smaller, faster fighter. Adding mass to compete at heavyweight, where Parkin walks around considerably heavier and works behind a grinding, pressure-based grappling game, is the sort of trade-off that has bitten light heavyweights making the jump before. Parkin’s brown-belt Brazilian jiu-jitsu foundation adds another wrinkle. Walker’s ground game has not always survived pressure from top position at 205. It has to survive against a naturally larger man at 265.

Walker’s frame will not translate as generously as some of the reach numbers suggest. He is naturally a light heavyweight who will now be giving up 25 to 30 pounds of fighting weight to a natural heavyweight. That gap tends to matter most in the clinch, in scrambles when a takedown attempt stalls, and in the third round of a fight that has stayed on the feet longer than one man wanted.

Parkin, for his part, has not fought since the Tybura loss based on the record on file. The layoff cuts both ways. He will be taking on a name with genuine highlight-reel equity and octagon experience stretching back to 2018, and doing it as the lower-marketed half of the matchup despite holding the divisional ranking.

UFC 332’s Utah date puts the event in a market the promotion has visited only sparingly for numbered cards. UFC 307 in Salt Lake City in October 2024 was the most recent stop. No main event, co-main, or additional bouts have been reported yet. Walker versus Parkin is the anchor for now, which is a curious place to start building a numbered card, though early bookings tend to fill out quickly once the calendar tightens.

For Walker, the calculus is straightforward. A move to heavyweight gives him a lane he has not attempted before, and doing it against a ranked opponent means the win, if it comes, immediately slots him into the top 15 on debut. The loss, if it comes on the numbers he brings up with him, does not necessarily close doors. Heavyweight has been thin at contender level for longer than any other UFC division. A Walker who can crack the top ten becomes an asset the matchmakers will build around. Whether the physical transition holds up against a 10-1 fighter who has been developing at 265 pounds for his entire career is the question the October card is designed to answer.

The rest of the card is expected to fill out across August and September.