Lewis Hamilton says overhauling Mercedes team-mate Nico Rosberg in the championship will be a "big challenge" but the Briton is sure that he has the pace to achieve such a feat.
Rosberg has won the last seven Grands Prix, including all four in 2016, to open up a 43 point lead over Hamilton, who has so far been stymied by a series of technical issues and incidents.
Hamilton recovered to second in Australia after being edged wide at the first corner, and battled back to third in Bahrain following first corner contact with Valtteri Bottas.
Hamilton was unable to set a qualifying time in China and placed seventh after colliding with Felipe Nasr on the first lap, and finished second in Russia after a recurrence of an MGU-H issue restricted him to 10th on the grid.
"Every weekend, we've got the car into a great place setup-wise - I just haven't been fully able to exploit it," he said.
"So the glass is half full for me. It will be a big challenge but there's a long way to go with 17 races left and, if the last four are anything to go by, there's a lot more still to come from us.
"The team has been on it 24/7 since returning from Russia so I'm confident they'll get to the bottom of the problems we've been having.
"I know I'm still quick. I've known that since day one in testing and, when I've had clean air and a damage-free car this season, I've shown it on track. I head to Spain confident of a good weekend."