Fernando Alonso has admitted that his F1 title hopes were effectively ended when Ferrari failed to get on top of a series of developments during the mid-point of the 2013 season.
While the Spaniard kept the championship battle alive at Suzuka, another win for Sebastian Vettel means it is almost certain that he will now lift the title for the fourth successive season – with Ferrari again set to end the year without any silverware to its name.
Vettel's march towards the title has come on the back of him winning the five races held since the summer break, but Alonso said that by that point, Ferrari's challenge had already been dealt a huge blow.
"The problem is our development,” he said. “The problem is that we didn't adapt to the tyres or had the steps that we planned. We arrived at the races in July with some updates that looked good on paper, but not so much on the track and I think that slowed down the performance improvement that we should have had.”
Alonso added that changes to Pirelli's tyres hadn't helped Ferrari's cause, but had been far from the only reason why he had dropped away from the championship lead.
"The Pirellis are an extra thing,” he said. “It is clear some teams lost a little bit of performance, some have gained a little bit of performance - like Sauber as we have said - but they had to make the changes because the other tyres explode.
“It was not a decision to make one team better than another team - it was a change so we could continue racing in the championship, so there is nothing we can do."