K1 would be an example in the past one might be able to call it MMA as it is a mixture of striking arts. However now, you would just look foolish to define it as such.
As a side note I really don't like the term MMA but we are stuck with it.
Pay close attention to how Kimura passes Helios guard with next to 0 effort.
You also when you watch the video you should also see how Kimura properly keeps himself positioned to prevent Helio from recovering guard.
Some more old school judo ground work
Relevant and AWESOME video of old School Russian Judo