It's really strange. We all know Sam has the game and the weapons. She beat Serena to win the 2011 US Open for goodness sakes so we KNOW she can do it!
Maybe she should go and have a chat with Andy Murray about dealing with the pressures of playing at your home Slam. He still hasn't won Wimbledon yet but at least he has not missed a semi-final there since 2008 and made the final last year! Sam has yet to make a quarter-final at the AO!