Dragon Ball, Vol. 15 by Akira Toriyama

It's the "Strongest Under the Heavens" martial arts tournament, and the world's greatest fighters have gathered! But Kuririn, Goku, Tenshinhan and Yamcha face mighty enemies. Taopaipai the assassin has returned as a cyborg--and Goku and Tenshinhan are on his hit list! A mysterious young woman has a grudge against Goku. The only "mystery" about bumbling salaryman Shen is how he made it to the final rounds. And the last contestant is the new and improved Piccolo, for whom the championship is just a stepping stone to take over the world...