That was not a loss, it was a total embarrassment. Brown was toying with him.
... I remember the camera during the match showing tournament director Gerry Weber's face in the crowd looking disgusted at having (reportedly) payed Nadal $500,000 from memory to play the event and watching his 'drawcard' getting the tar beaten out of him.
Damn I wish I save that pic and from memory I think it was around when Brown was leading 6-4,5-1 or thereabouts.