On Friday, May 20, former ONE flyweight Muay Thai champion Jonathan Haggerty will take part in ONE's inaugural flyweight Muay Thai Grand Prix tournament. Against him will be former title challenger Walter Goncalves. With the best of the best at 135 pounds fighting for the Muay Thai Grand Prix belt, expect fireworks from start to finish. View this post on Instagram Instagram PostIt's been over two years since 'The General' lost his title to reigning champion Rodtang Jitmuangnon. The Brit's two-fight rivalry with Rodtang was ranked as one of the best ever just by the sheer violence it had. With both rivals entering the Grand Prix tournament, fans are hoping the two will meet each other in the finals to run it back for a third time.After dropping the belt to Rodtang and losing the subsequent rematch back in 2020, Jonathan Haggerty has compiled a strong three-fight winning streak. With every win, we saw the Brit improve on his strengths and fix the holes in his game. View this post on Instagram Instagram PostComing into ONE 157, we might see the most improved version of 'The General'. Today we list down three reasons why Jonathan Haggerty might win the ONE flyweight Grand Prix Tournament.#3. Jonathan Haggerty gave Rodtang the biggest problemsWhen Haggerty won the ONE flyweight Muay Thai belt back in 2019, he called out Rodtang for his first title defense. It was a brazen move as the Thai warrior was considered one of the most frightening fighters in the world.The two met for the first time in August 2019 in a razor-close slugfest that was pedal-to-the-metal from start to finish. View this post on Instagram Instagram PostDespite winning early by using his length and sniper-like precision to keep Rodtang at bay, Haggerty struggled to stop the Thai's onslaught in the latter rounds. Still, the courageous Brit fought tooth-and-nail despite getting hurt and dropped. As the fight closed, the decision was up in the air as it narrowly went to Rodtang.The first bout was so epic that an immediate rematch was set and the two faced each other again just a few months later. Much like the first fight, Haggerty saw early success but later succumbed to the pressuring power of Rodtang. The bout ended via TKO as 'The Iron Man' dropped 'The General' three straight times in the 3rd round.Watch their rivalry recap here:Despite losing two straight to the champion, no one else came close to beating him as much as Haggerty did. His length, precision and sheer willingness to go into a firefight with Rodtang presented problems that haven't been replicated by future challengers yet.