It has the potential to be a brilliant contest. It also has the potential to end early, with both sides having decent power, and great technique/timing. Brook might surprise a few with his boxing IQ in this one. Spencer is going to bring it and has a very well rounded arsenal but he leaves openings and Kell can be quite devastating if you leave holes. Either may have to get back up off the canvas in what I think will be a war which will not go to points. Brook for me, by KO /TKO late.