Rafael Nadal accepts that recent clay court defeats to fellow Spaniards David Ferrer and Nicolas Almagro have affected his morale.
During April the world No 1, the most dominant clay-court performer of all-time, was sent packing from tournaments in Monte Carlo and Barcelona at the quarter-final stage.
The eight-time French Open winner has also won those two events on eight occasions but is experiencing a crisis of confidence as the Grand Slam visit to Roland Garros looms ever closer.
This week, the tour heads to Madrid for the third Masters series event of the season and Nadal admits: "Losing always creates doubts, anyone who tells you the opposite is lying.
"There is no benefit in losing. The easiest thing is to keep winning because everything comes naturally without thinking.
"When you lose you think more about where to move on the court, where to hit the ball, but that is what has happened and, as I have said various times, you cannot win in Monte Carlo or Barcelona 12 times.
"To lose twice in the quarter-finals is normal. Perhaps what has been abnormal is what has happened in recent years."
Yet Nadal is hoping home support in the Spanish capital may help him: "I feel a bit better and I am desperate to play in this tournament because it is always special for me.
"The energy this tournament gives me is a bit different and hopefully you will see that on court."