Joshua kept the distance well and utilised the jab jab grab much like Klitschko used to do. Also I think he moved more around the ring in the fight than he ever has had to do in his whole career which represents a good change in his game. Wish Ruiz had tried more to keep the fight on the inside but it seems like he fell off and lost discipline on the high of winning the last fight, didn't really do a lot to make it difficult for AJ.
Looks like the winner has now been ordered by the WBO to face Oleksandr Usyk (in my opinion top 5 pound for pound), this would be a great heavyweight bout almost on the level of Fury v Wilder. Hopefully they don't sidestep and Joshua can just improve with the opposition he continues to face from now on.