Goku was training with SSJ3 in the open field. Then, he realized that a power level was coming. It was Raditz! But this time, Raditz was a SSJ. Goku asked Raditz for a sparring match. Raditz agreed, and they started fighting. SSJ3 Goku had the upper hand, but he reverted to his normal form. Goku went SSJ instead, and they had an equal, brother to brother match. They both got tired, and they went home to tell the news of Raditz coming back.

Goku knew it was a dream. He wished that he could fight him. Someday...
Goku vs Raditz (original)

Original Raditz vs Goku

SSJ3 Goku vs SSJ Raditz

Raditz vs Goku