Saitama and Luffy stand face to face, ready to do battle. Saitama: "Alright, let's make this quick. I gotta get to the meat sale." Luffy: "Hey, I'm not gonna let you take me lightly. Let's go!" The battle begins, with Saitama charging forward and Luffy dodging and countering. Saitama throws a punch, but Luffy stretches his body and dodges easily. Luffy counterattacks with a Gum Gum Pistol, but Saitama simply blocks it with ease. Saitama: "Dude, is that all you got?" Luffy: "Just wait and see!" Luffy then uses Gum Gum Balloon to reflect Saitama's next attack. Saitama uses his Serious Punch, but Luffy manages to reflect it back using Gum Gum Balloon. Luffy: "Take this! Gum Gum Bazooka!" Luffy launches Saitama into the air with a powerful punch. Saitama, however, flies back down using his Serious Fart, surprising Luffy. Saitama: "Alright, now it's my turn. Serious Series: Serious Punch!" Saitama's punch lands the finishing blow, knocking out Luffy. Winner: Saitama Saitama's unmatched power and skill allowed him to win the battle. Though Luffy had a higher guard and speed, Saitama's one-hit-kill move, Serious Punch, was too powerful for Luffy to handle. Additionally, Saitama's ability to fly and Serious Fart move made it difficult for Luffy to land hits. Overall, Saitama's overwhelming power was the deciding factor in this battle.