After Indian Wells I sat down with my coaches and spoke about making sure my priority was to peak for the Grand Slams but I can still play great tennis in the Masters Series and try to win every match I play in. That's what I need to be focused on and that's what we talked about together after Indian Wells. I was nervous before I played against Kohlschreiber and I was just rubbish. You gear towards each Grand Slam. They are the four peaks of the year where you want to be playing your best tennis and I achieved that in Australia. Since then it's not been particularly good but a lot can change from week to week. I went from playing some of the best tennis of my life in Australia to playing some really bad tennis in the space of a few weeks and it can change. I just need to keep working.