Saitama vs. Suiryu

Saitama vs. Suiryu is the fight between Saitama and the martial artist Suiryu.

Prologue
Saitama (disguised as Charanko) faces Suiryu in the finals of the Super Fight Tournament. As soon as the match starts, Suiryu delivered fast, powerful blows towards Saitama, but always stopped mid-way. Saitama's only reactions to these attacks were stopping his wig from being blown away by the dangerous wind pressure from Suiryu's blows, or slightly moving away. Being unable to keep up with Suiryu's fast moves, and seeing Saitama with both hands in his head, the Super Fight Announcer assumed Saitama was too shocked by Suiryu's moves to react.

Hearing this, Suiryu sighs in annoyance as he states that they had no idea what was really happening. He reveals that he never had any intention to hit Saitama at all, and was merely sizing him up. The lack of reaction from Suiryu's attacks made him realize that Saitama was strong, and that he was also trying to figure out what the martial artist was capable of. He also said he could see in Saitama's eyes that he wasn't after fame or prestige, but rather for a fun battle, to which Saitama agrees. Acknowledging Saitama's strength, Suiryu tells him he is strong too, and that he entered the tournament because he wanted the prize money, but deep down he also wanted to fight strong opponents. He explains that he became strong to the point of being bored, but he also says that being strong was fun, since he was guaranteed to have an easy, carefree life, and that whenever he got the chance to fight strong people, he got excited, looking up to find a thrill to satisfy himself.

Saitama deems Suiryu as a positive guy, and tells him he entered the tournament so that he could experience real martial arts, revealing he also craved for strong opponents. However, he also states that he was rather disappointed, since all his matches ended with a single blow, and that maybe he just wasted his time entering the tournament. But seeing the huge cheers and Suiryu's confidence, Saitama realizes that he might have finally found a worthy opponent.

Both made a deal: Suiryu would give Saitama the martial arts experience he was looking for, and Saitama would do his best too so that Suiryu could have a fun time. With that settled, the real fight begins.

Battle
Suiryu takes the initiative and strikes Saitama with a kick, several times faster and stronger than the others he used before. It nearly sends Saitama out of the arena, much to everyone's surprise. Suiryu keeps attacking Saitama with kicks, while the latter just dodged or protected his wig. Eventually, one of Suiryu's blows sends Saitama upwards, and with amazing speed and technique, he jumps and kicks Saitama down still in mid-air. Saitama crashes on the arena opening a huge hole in it, and before he had time to recover, Suiryu lands on his back and kneels Saitama's head to the ground.

Astounded by that demonstration, everyone believed Saitama was dead after those attacks. Even Suiryu himself thought the match was over, and states with disappointment that maybe he should have held back. To everyone's surprise, Saitama casually gets up, and is relieved his wig was still intact. While they re-engage in their fight, the other contestants watch the battle in awe, and Sour Face even stated that if "Charanko" kept holding up like that, he could end up winning. The other fighters disagree, as Max and Sneck realize that Suiryu had been only using leg techniques at that point, and that he was most likely doing so to limit his combat options for his own amusement. As Sneck claims Suiryu's cocky attitude didn't change, they concluded he was still hiding his true power. Suiryu himself confirms their theory, stating that since Saitama had beaten all his opponents with punches, he'd fight with kicks because it'd be more fun that way.

Eventually, Suiryu notices how Saitama kept avoiding his attacks and how his defense was rock-solid on the cranial area, even though it gave away everything else. Unaware that Saitama was merely protecting his wig, Suiryu questions him about his daily routine, to which Saitama accidentally reveals that he kills monsters. Suiryu didn't fail to notice that, which led to Saitama making up excuses saying he wanted to be a hero someday (as Charanko).

Suiryu then reveals his complete distaste for heroes, claiming "hero" is just a nice name, and that they are all condescending people who preach their justice and expect something in return from their good deeds. He also said it's pointless to rely on them, since no matter their level, they could never save the world from a crisis. To Suiryu, everything that defines a hero is unnecessary for the easy life he seeks, and they are the very foundation of boredom. Much to everyone's surprise, Saitama didn't dodge or block Suiryu's next kick, which led his wig to be blown away. Clearly displeased with Suiryu's rants, Saitama finally decides to attack, but stops mid-way before he could end the battle with a single punch again. The wind pressure from his blow was so strong that Suiryu's clothes were ripped as he stared in shock at Saitama.

Saitama was immediately disqualified when the staff realized he was wearing a wig the whole time, claiming that since the last tournament (with Garou posing as Wolfman), fraud was not tolerated. Suiryu, however, doesn't accept winning like this and, after ripping the remnants of his gi, he starts fighting seriously. Enraged, Suiryu's blows were strong enough to split the arena in half, and he even managed to lift half of it with a mere step. He tell Saitama losing wasn't fun for him, and with that he started delivering blows with such ferocity that the security staff were afraid to stop the fight. When he notices his attacks didn't seem to have an effect on Saitama, Suiryu does a powerful step-in, shattering half of the arena in pieces and using its momentum to strike Saitama full force, ripping his arm-band as a result. Saitama, who didn't show any reaction to the blow, states he was finally beginning to understand what martial arts were. When questioned by Suiryu what his conclusions were, Saitama said that they basically consisted of "moving around in a way that's kinda cool"

Enraged, Suiryu rushes on Saitama's direction, who was clumsily spinning around trying to imitate Suiryu's spinning technique. This resulted in an accidental hip strike from Saitama, which adding to Suiryu's tremendous momentum, sent him flying away from the arena, thus ending the battle.

Aftermath
Suiryu is left in shock at Saitama's strength and hopes not to run into him in the future. Saitama is chased away by the security staff while Suiryu is awarded with the prize money.