Kuerten's constant close losses in HC GS (AO/USO) in 1999-2003

Played and lost all 10, of which 9 in close fights - 5 five-setters and 4 tight, tiebreak-filled four setters. Could've been 10 of 10 if he didn't clutch out the epic against Mirnyi in 2001 USO only to get destroyed by Kafelnikov in QF.

Specific scores:

1999 AO: l. to Safin 6-3 5-7 4-6 6-3 6-4
1999 USO: l. to Pioline 4-6 7-6(6) 7-6(14) 7-6(8) (has there been any other match to feature three extended tiebreaks?)
2000 AO: l. to Portas 4-6 4-6 6-4 7-6(8) 6-4
2000 USO: l. to Arthurs 4-6 6-3 7-6(4) 7-6(1)
2001 AO: l. to Rusedski 4-6 6-4 6-3 2-6 9-7
2001 USO: beat Mirnyi 6-7(5) 5-7 7-6(4) 7-6(3) 6-2 and lost to Kafelnikov 6-4 6-0 6-3
2002 AO: l. to Boutter 3-6 4-6 7-5 6-3 6-3
2002 USO: l. to Schalken 6-3 7-6(6) 6-7(5) 7-6(4)
2003 AO: l. to Stepanek 5-7 6-3 7-5 4-6 6-3
2003 USO: l. to Tursunov 5-7 6-2 6-2 4-6 7-6(1)

That's five straight five-set losses at the AO in particular and four straight close TB matches at the USO, three of them being losses.
What made Kuerten particularly susceptible to close losses, was he generally unclutch to keep losing early and not getting to the opponents who could outplay him throughout (like 2001 USO)?
Hardcourts were pretty brutal on his hip. He hobbled through that kafelnikov match and had surgery soon after, was never the same player again. And top players losing early in majors back then was sort of the norm, it's sort of hard to understand unless you were there.

Also he had trouble with big servers on fast courts(rusedski, Arthurs, boutter) because he stood far back. If you told anyone in 2002 there would be a time when someone like Nadal could win the USO standing that far back everyone would laugh at you, it would be too farfetched to believe. Like so many things that are the norm today...

Also kuerten was a fun loving guy, commentators said he didn't do much training in the offseason before the AO.