The sensation of air beneath his feet, the sound of wind whistling past his ears, the thrill of the fight flowing through his veins - Goku's senses were on overdrive as he approached the city of Z-City. 

He had felt Saitama's power earlier, and he knew that the One Punch Man was worth checking out. As he landed in the bustling metropolis, Goku's eyes surveyed the scene, taking in the people who went about their day-to-day lives, oblivious to the epic battle about to unfold.

Suddenly, a gust of wind and a loud explosion alerted Goku to Saitama's presence. Without hesitation, he shot into the sky, eager to meet the strongest man on Earth.

Saitama stood in the street, looking unassuming in his simple, plain clothing. But Goku could sense his immense power. "So, you're the one they call One Punch Man," Goku remarked, as he flexed his muscles.

Saitama raised an eyebrow. "And you must be Goku, the legendary Super Saiyan. I've heard about you too."

Goku grinned. "This is going to be epic." Saitama vanished for a moment before returning, dressed in his iconic costume. The two warriors circled each other, their power radiating around them. Goku started with a sudden test punch, but Saitama dodged it easily, his movement quick and precise.

Goku decided to power up to his Super Saiyan level, his aura of energy enveloping him. Saitama remained unfazed. "Is that all you've got?"

Goku was surprised but not deterred. He charged forward, delivering a flurry of devastating punches and kicks to Saitama who evaded them with ease. After exchanging several blows, Goku became aware that Saitama still held back power.

"Impressive," Goku commented, his admiration for Saitama growing. "You can dodge my punches and kicks, even when I'm at my Super Saiyan level. But I can tell you're still not using all of your power."

Saitama smirked. "You're right. Let's turn it up a notch then."

With that, Saitama charged forward, his fists a blur as he hammered Goku with jabs and uppercuts. Goku retaliated with a flurry of his own punches, but Saitama kept dodging.

Goku then decided to use his Kamehameha wave, focusing his ki within his hands, the Z warrior unleashed a massive blue energy blast.

However, Saitama stood motionless, let the attack hit him head on. The civilians turned and witnessed a blinding ray of blue light as it illuminated miles of the city.

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Goku remained still as the smoke slowly cleared before him revealing Saitama standing unphased by the saiyan's attack.

"Ok" said Saitama with a casual tone, a plain expression on his face. Goku, determined not to back down, rose from the rubble and attacked again. He pulled out all the stops, using his most powerful technique, the Spirit Bomb. 

The glistening blue orb of energy appeared above his hand. The Spirit Bomb was ready to be launched, and Goku took aim at Saitama, his eyes focused on the One Punch Man.

Letting out a soft breath, the Saiyan threw the small but powerful sphere right for the bald hero.

"Impressive," Saitama praiseed, his voice barely above a whisper. suddenly he disappeared, reappearing behind Goku as he launched a series of quick strikes. "Consecutive normal punches!" Goku tried to block and dodge, but Saitama was too fast, too skilled.

Before he knew it, Goku was on the ground, struggling to catch his breath. Saitama was standing before him, a few meters away. "You're not bad, but you're still not ready to defeat me."

Goku stood up, his face lined with determination. "I won't give up, I won't stop until I've given it my all."

Saitama nodded, acknowledging Goku's determination. "Okay, let's keep going."

With renewed vigor, Goku charged forward, his fists flying towards Saitama. But Saitama simply stepped to the side landing a devastating uppercut that sent Goku flying through several buildings. Goku was covered in rubble and bruises but stood up once more.

Closing his eyes, his golden hair reverted back to normal as a red aura illuminated his body. "You can strike me down all you want, but I won’t go down so easily!"

Saitama stared in amazement at the Saiyan's Super Saiyan God form.

Advancing towards Saitama once again, his speed and power increasing with every step. Saitama readied himself, impressed by the new transformation of his opponent.

The two clashed, sending shockwaves through the city as their fists collided, each trying their best to outdo the other. 

Goku landed several solid strikes, but Saitama remained unaffected. He delivered a powerful punch that sent Goku flying across the city, impacting the center of Z city causing civilians to run away screaming in fear.

"Heh, this is really getting my heart racing" Sensing the ki around him, he abruptly aimed his index and middle finger out in front of him, unleashing god ki blasts like a finger gun in quick succession.

Goku struggled to hit the bald hero as he evaded the rapid-fire god ki blasts, each one impacting the ground and buildings around him, causing explosions and destruction. He needed to come up with a new strategy if he wanted to defeat Saitama.

Gathering his energy, Goku shot into the sky, his aura blazing with power. He began to charge his most powerful attack, the Dragon Fist. Saitama looked up, sensing the immense energy signature emanating from Goku. He braced himself for the incoming attack.

From the skies, Goku descended with his fist glowing with powerful golden energy. He struck Saitama in the center of his chest with the Dragon Fist, a dragon made of red god ki struck Saitama as the hero's eyes widened in surprise as the impact caused a fierce explosion on impact, utterly Wiping out miles of Z city.

The dust cleared, revealing Saitama laying on the ground, his clothes torn and burned. Goku landed beside Saitama, realizing his opponent was still fully conscious even after such a fierce attack.

A smirk grew across the hero's face as he rose to his feet. "Amazing son Goku, you managed to actually leave a mark on me. Maybe I will have to take this serious"

Goku grinned, happy to have gained Saitama's respect. "Thank you," he said, preparing for another round.

Saitama activated his serious punch, his body becoming engulfed with incredible strength. Goku could feel the tremendous energy radiating from Saitama, and he knew that this was going to be his toughest battle yet.

Goku powered up, transforming into his Super Saiyan Blue form, his aura erupting like a volcano. The Super Saiyan Blue form was the ultimate form of Super Saivan, and Goku felt confident that he could finally beat Saitama.

The two warriors charged at each other, their fists colliding with such force that the shockwaves sent massive tremors throughout the city. Buildings crumbled, and the civilians fled in terror. Goku and Saitama exchanged blow after blow, neither one gaining the upper hand. Every punch was like a thunderbolt, every kick like a crashing wave.