The Limitless One looks to fend off The Technical Savage in this championship battle at the WWE Performance Center

As difficult as Keith Lee's journey was to become NXT North American Champion, he's quickly learning that staying on top is even more trying.

The Limitless One retained his title in a hard-fought victory over Cameron Grimes, who had to adapt his usual approach against the uniquely powerful Lee. The Technical Savage wowed just as much as the champion, even at one point connecting with a massive German suplex on the 320-pounder, but his attempt at the Cave-In was snuffed out by Lee moments later, and from there, The Limitless Superstar planted Grimes with the Big Bang Catastrophe for the win.

Lee's night was far from finished, however, as he was subjected to an ambush attack by Damian Priest, who drilled him with a nighstick. Dominik Dijakovic — who also felt the brunt of a Priest ambush last month — chased Priest off, but then was rewarded with a Spirit Bomb by Lee, who may have been confused about who attacked him. It was a reminder for Lee just how many other challengers are breathing down his neck.