I think Tsonga deserves a little more credit for these two victories than you seem to give him here, Sawan. Rafa's loss in the AO semifinals wasn't at all a disgrace/lowlight, nor was Muzza's defeat to him in the first round there either - Tsonga just played FANTASTIC, there, and it was with good reason that he ended up in the final. It was fully deserved.
A low point is not the equivalent of a disgrace. The thread starter did not insinuate that Murray's 1R AO loss was a disgrace, nor that it was undeserved, but simply that it was perhaps the main low point of his season. And I would agree with that; for any Top 10 player, to lose in the 1R of a Grand Slam is a serious low.