Very strange list. Guess there's more to mental toughness than bps. Ivanisevic being a choking clown in finals has already been mentioned, Soderling is the same, and Troicki and Mugdasco being anywhere near the top of a "clutchness" list is nuts
Also, Ferrero and Lee being 2nd and 3rd from the bottom is weird as well, Ferrero is a fighter as was Lee (at least in Davis Cup).
Kind of funny Oli Rochus is near the top and Christophe Rochus is near the bottom