I'm excluding Muhammad's transition defense in this category since that was mostly about effort. This category is all about his half-court game.
Muhammad had the difficult task of guarding Otto Porter for most of the game, but he also had to guard Markel Starks when the team needed to shut him down, and Jabril Trawick at times.
UCLA played a tight man-to-man defense, which suited Muhammad perfectly. He was always on his man, not even leaving when opponents looked like they might cut to the basket, knowing that his man was the biggest threat on the floor and couldn't be left open.
Muhammad really shut down his opponents, allowing just six points by my count to his man when defending them, including a cheap two points by a big man who scored on a hook shot inside.
The only knock on his game was that he didn't play well inside against Porter (something that Dick Vitale and Bruce Pearl were quick to point out and very critical of). However, that was a one-time thing, as he played good post defense against Porter three times, giving himself a 75-percent success rate.
Overall I was very impressed by Muhammad's defense, as I had previously considered it to be among his worst aspects. However, he proved me wrong on Monday night.