As my friend
burger_eater, AKA Harry Connolly,
has pointed out, his character Ray Lilly from his Twenty Palaces books is
entered in a Suvudu cage match against Anasûrimbor Kellhus, whom I'm afraid I've never heard of but sounds pretty badass from his description. Harry's written his version of the way the match goes and you can read it there.
WARNING! Not for the delicate of sensibilities; it gets VERY messy towards the end.