On the scales Knockout was the heavier man, weighing in on the divisional limit of 105lbs. This is the same as he was when on won the title last October by out-pointing the very talented Carlos Buitrago.
As for Diaz he has a full 1lb under the limit coming in at 104lbs, incidentally the same weight he was last time out when he stopped Luis De la Rosa in just 178 seconds, also last October.
Although Diaz was the lighter man he is also the much taller, having several inches of height and reach advantages over his Thai foe, as clearly seen in the picture.
For those who haven't seen Diaz in action we've included a video of him sparring from an open training he held recently.
The fight will air live in Thailand tomorrow on Channel 7 on a broadcast that is set to begin at 14:00 local time.
(Image courtesy of Thairec.com video courtesy of Narubed Tanimpas)