DB Chapter 118
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
"The Cruelty of Tenshinhan" (ヤムチャ破れる！！, Yamucha Yabureru!!; Literally meaning "Yamcha's Beaten!!") is chapter 118 of the Dragon Ball manga.
Everyone watches as Tenshinhan stands firm and bounces the Kamehameha back Yamcha's way. Yamcha is just barely able to jump up to avoid it, and Tenshinhan follows him as the Kamehameha hits a building. Yamcha's pissed about the deflection, and Goku yells for him to look out. Tenshinhan's mid-air right next to him, and he kicks Yamcha and tosses him back down to the ring. Yamcha lands really hard and he's knocked out. Tenshinhan comes down, landing knee first on Yamcha's leg, breaking it.
Goku runs in the ring, and the announcer comes in worried as well, while Tenshinhan just smugly asks the results. "Y-Yamcha is unable to continue the match in his condition. T-therefore, it's Tenshinhan's win...!!" The announcer tells a guy that the leg is broken and he needs to be taken to a hospital, and Pu'er flies in, saying he'll do so. Pu'er changes into a magic carpet, and Goku and Kuririn help Yamcha onto it. Pu'er flies off with him and Bulma says she's going to follow.
Goku's pissed, and Tenshinhan says he should be thankful he's such a nice man and he didn't kill him. Goku says he'll get him, but Tenshinhan just laughs and leaves the ring, doubting Goku will make it to the finals. Tsuru-sennin is pleased with this, and thinks Kame-Sen'nin must be getting pale.
"W-well then, we'll begin the second match. It's Jackie Chun versus Man-Wolf!" Man-Wolf heads out first, glaring at Jackie on the way. Chiaotzu gives Tenshinhan the peace sign, and Tenshinhan says it was only natural, but he'd thought the Kame-sen Style would be better than that. He tells Chiaotzu that Yamcha was probably the best of Kame-Sen'nin's three students, so he'll probably be the winner, and Chiaotzu will be the runner up.