i think Denko served for all 3 sets in that Roland Garros SF - or at least 2 of them and up a break in other set
-today he lost from 6-4 3-1
-in AO 2010 QF he lost from 6-2 3-1 40-15*
-in AO 2006 QF he was 4-6 6-3 5-3 (lost last two sets 6-7 6-7)
-in US Open SF he was 3-1 up in first set and 5-3 in third set (lost 5-7 1-6 5-7)
Its really incredible considering Davydenko is no mental midget. He is actually very strong metally, his win-loss in finals, his record against Nadal is testimony to it.
But this just shows how a prolonged domination over a long stretch effects a player in big matches