Did you mean U7? Anyway...
M1 - Ten wins via Taiyoken + Kikoho. Vegeta has nothing to really counter it effectively.
M2 - Kuririn wins with Taiyoken x100 and ringout like against Gohan as long as he dishes it out straight away, of which I'd assume he would against someone who he hates for killing him. He can also use Kienzan effectively enough to injure Freeza whilst sticking to the no-killing policy.
M3 - Could go either way, depending on what technique each fighter uses first. Piccolo is more skilled at hand to hand combat, has more range with his arm stretching and can counter the Mafuba, but Roshi could win with the Bankoku Bikkuri Sho. Overall, I'd say Piccolo holds more advantages and better stamina, so he wins.
M4 - As long as the plot isn't nerfing Goku's intelligence, he wins. He was a lot of good techniques to fall back on such as Shunkan Ido, Taiyoken and Kienzan, whereas Gohan only has straightforward Ki attacks.
M5 - Kuririn wins by virtue of having a far more potent Taiyoken, and a regular one will be enough to damage Ten's eyes. He wouldn't be dumb enough to let himself get hit by the Kikoho, whereas Ten would have a difficult job avoiding the Taiyoken.
M6 - Probably Piccolo. Other than Shunkan Ido, Piccolo can counter Goku's techniques fairly well, not to mention it's been shown in Super he can now charge the Makankosappo whilst moving if he finds a good opportunity to use it as a finishing blow. Piccolo also has the Mafuba if necessary, so he's got a lot of ways to counter Goku compared to their 23rd TB match.
M7 - Purely depends on whether or not Kuririn gets the chance to use Taiyoken x100. If so, he's got this with ease. If not, it'd be an extremely close match as both are heavily skill-oriented, though I'd say Piccolo would edge this out. Most of Kuririn's techniques are well known by Piccolo, whereas Kuririn doesn't seem aware of Hellzone Grenade.
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