There are cases of fighters going easy on their opponents. Rory did not against BJ. He fought very poised and as he said, "if the knock out was there he'd go for it, but it wasn't."
Matt Hughes vs Royce.
Anderson Silva vs Thales Leites
Vitor Belfort vs Joe Charles (Old training partner and had a gentleman's agreement to grapple. Vitor won by armbar. I watched this fight live on PPV and was like, "this isn't how Vitor fights." But it also showed me that he had a Jiu Jitsu game many years later against the LHW title holder.)
Maybe Jose vs Faber towards the latter round.
Marcus Aurelius: Tell me again, Maximus, why are we here?
Maximus: For the glory of the Empire, sire.
Baked, not fried... the healthy choice.