I only found out this morning Nadal lost. I was following his match on my phone last night and the last time I checked the score they were in the 3rd set, Nadal was serving to stay in the match at 4-5.
This is probably not a bad loss for Nadal if he's having back issues. His confidence might also not be there as much after the AO final debacle. But the upcoming clay season should really help to repair all the damages.