Mark Webber has questioned Red Bull's decision to change him onto a three-stop strategy during the Japanese Grand Prix.

The Australian was battling with Romain Grosjean for much of the race until the decision was taken to convert him from the conventional two-stop to a three-stop strategy.

While the decision did not take Webber out of the battle for the win, the time it took for him to overtake Grosjean after his third stop cost him the opportunity to go on a challenge Sebastian Vettel for the win.

"I was a little bit surprised by the switch to three [stops]," Webber said post-race.

"I asked was it the right thing to do?

"Seb went a bit longer, but the target for two stops was achievable. I felt we could get to the laps we were looking to get to.

"In the end Seb did a good race, [his] strategy worked out perfectly. Three [stops was] not absolutely ridiculous but it is high risk and you have to clear people.

"We were piggy in the middle and got back to position but Seb jumped both of us.

"I didn't think the battle was going to be with Seb, [but] it was pretty much done when we didn't do enough damage on the three stop against Seb's pace on two."

While Webber admits the decision did not take him out to contention he knew the challenge of passing Grosjean would hinder any chance of attacking Vettel.

"At the end of the race DRS is not as effective as you are on the limiter," he explained. "When you arrive on someone you want to get the job done pretty quickly.

"I hoped to get it done a bit earlier, knowing his tyres were going to be quite tight towards the end of the race, [but] I was quite low on wing when I arrived on him."

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