World number two Andy Murray lamented his poor form at Indian Wells after crashing out of the tournament on Monday.
Murray was surprisingly eliminated by Federico Delbonis 6-4 4-6 7-6 (7-3) in the third round of the BNP Paribas Open.
The two-time grand-slam champion quickly bemoaned his performances at the ATP 1000 event, despite having reached the quarter-finals on five occasions, including last year's semi-final against Novak Djokovic.
"I think it's just the conditions here I have just struggled with throughout my career. I have never really felt that I played my best tennis here," Murray said following the two hour, 46-minute defeat.
"I have tried and had many different preparations where I've got here early and spent a lot of time on the courts, and sometimes I arrive later, like this time from Davis Cup.
"Obviously it takes time to get used to new conditions regardless of where it is, but I have just never really found a way to get comfortable here throughout my career. It's a shame."
Murray added: "I changed stringing my racquets like four or five pounds tighter than I was at the Davis Cup, which is significant.
"Really the tightest I have strung throughout the whole year would be at this event, and I still feel like I can't really go for my shots. I feel like when I do, I make mistakes. But even you look in the tie-break I missed a couple of backhands long, and then also a couple of balls in the bottom of the net.
"I really don't know. And like I said, I have tried many different things. It just never quite worked out for me here."