The place and depth of Edwin Valero's cut against DeMarco was pretty bad. Valero's corner did a good job minimizing the bleeding though.
http://www.boxingscene.com/uploads/25190/edwin_valero_cortada.jpg
Credit to Boxing Scene for the image.
It wasn't the worst but Kats had like three or four.
http://assets.sbnation.com/imported_assets/16032/katsidis33535.jpg
Vazquez
http://images.ringtv.com/images/7/00/00/62/02/6202_586.jpg
Vitali
http://img.dailymail.co.uk/i/pix/2007/05_02/vitalli270507_468x748.jpg