I thought about ths yeterday too. It migh be a little confusing.
The coloring that green is used for winning cound and red for losing is used throughly tru the ladder, iirc the total score is how as red if the challenger loses, and green if the challenged loses too. This is a good and throuly worked out thing.
However, I find the coloring practice a little unusial an dsome times confusing. I think it would be easier to read the lists as a whois lf the colors followed the users (green for challenger red for challenged) throughuot, insted of the current use. that means also in the score and matches list.
However this would break the w-d-l lists, maybe a better solution would be to use other colors on the match details pages? I dont know that seems messy too.
The wictory-draw-loss colors are well used on most pages, but seemingly a lil confusing on the match details page.
blame the Eliza effect ofr this
Edit:
When I think about it Willis' suggestion is a good one.. make the color follow the winner and loser on the match details page. Tha would not break the usage as of now, only enhance it.