Max Verstappen recorded the fastest time through the first day of mid-season Formula One testing on Tuesday.
Despite back-to-back wins at the last two races, Hamilton was struggling for performance prior to the Spanish Grand Prix.
Wolff is confident that both the driver and the team are committed to each other and is certain they can get it sorted out sooner rather than later, especially since they got back to winning ways at the Circuit de Catalunya.
Despite winning in Spain after one victory in the opening four grands prix previous year, it did not turn out to be the race that kick-started his season.More news: Mikel Arteta given Arsene Wenger backing for Arsenal job
Hamilton started the season with pole position in Melbourne but Ferrari won the first two races. McLaren was third-fastest with young reserve driver Lando Norris. Norris' vehicle stopped on track in the afternoon causing a red flag, but was soon back out once McLaren discovered a setting issue and rectified the problem. On top of that, we had different tyres, which maybe suited others more than us.
"There's definitely some differences", Norris said.
Despite their lack of pace in Spain, where not only were they not able to extract the same speed from their tyres as Mercedes but were also unable to coax them to last as long as the silver cars, the Italian team have had the most versatile vehicle so far this season.
"Apparently, the changes that were made did us more harm than it did our opponents", Ferrari's Vettel said. I'm very interested to see what happens in Monaco next time out as they should be in better shape in qualifying. Kevin Magnussen in the Haas finished in P6 behind Ricciardo. The issue was notspecified by the team but brought an early end to Magnussen's running.
Daniel Ricciardo, meanwhile, had an anonymous race.More news: Congo warns of 'new phase' in Ebola outbreak after first urban case
Lewis Hamilton got his mojo back in Spain while Pirelli's tyres may have had a say in the first round of the development war... Mercedes won the fourth race in Azerbaijan, but it was clear that it was surrounding circumstances that helped them win.
Charles Leclerc of Sauber and Sergio Perez of Force India closed out the top 10.
Valtteri Bottas was celebrating second place on the podium this weekend at the Spanish Grand Prix. Today was not a good day but it's important to understand why.
"The conclusions are that there will be a lot of things to watch, to analyse and double check", Kubica said. "This is when we are going to start trying to continue to apply the pressure".
"I think we have the same tyres in France and Silverstone so it's important that we find an answer".More news: Surgeon General Attends To Medical Emergency On Delta Flight
There was also more track time for Robert Kubica, who followed his FP1 run for Williams with a full day of testing and completed almost two race distances. Hamilton exited the pit in second place.
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