As much as Superlek Kiatmoo9 admires Jonathan Haggerty's improvement over the years, he's still unsold about his ability to dig deep when it matters the most.The reigning flyweight kickboxing world champion will challenge 'The General' for his bantamweight Muay Thai belt in the curtain closer of ONE 168: Denver on September 6.Superlek is quite confident about leaving Ball Arena with 26 pounds of gold, especially if their fight reaches the championship rounds.According to 'The Kicking Machine', Haggerty has yet to prove he can survive in deep waters especially when the pressure is at its highest.The Thai megastar explained in a ONE Championship interview:"I'd like to win by knockout. Haggerty has never reached the fourth round when defending his belt, but I have." View this post on Instagram Instagram PostIn hindsight, Haggerty hasn't gone the distance in his last three contests since he's put his every opponent to sleep. The case can be made, though, that the British double champ showed great resolve in his last title defense against Felipe Lobo last February.Haggerty was on the verge of getting dethroned early in the fight but survived a knockdown to score a come-from-behind TKO in the third.However, Superlek doesn't seem too impressed. When push comes to shove, we'll see whose warrior spirit will prevail at ONE 168.Tickets for this historic event are available via TicketmasterSuperlek ready to face Jonathan Haggerty in his best formDespite owning a victory over the two-sport champion when they faced off a few years back, Superlek knows Haggerty is a totally different fighter now. View this post on Instagram Instagram PostFor one, 'The General' has found a home at bantamweight, where he was finally able to tap into his full potential.'The Kicking Machine' said in a ONE interview:"Haggerty has a lot of strengths, barely any weaknesses. He's fast, has excellent footwork, and is a technical fighter with knockout power."