This is ridiculous. I'm playing on expert and I just can't knock anyone out although I keep hitting them and hitting them. I've had Rashad in full mount for basically the whole round and kept landing punches from posture and still nothing. Then he counters a leg kick in round 4 and I'm dazed.
You can no longer just spam punches from the mount. You need to pick your shots and mix it up between the body and face. You will know when you land a solid shot because you hear a nice thud sound. As far as standing, practice your timing with the duck and roll. Those counter punches are beastly.