Dani Pedrosa was never a factor at Indianapolis, branding it a weekend to forget and left to question what had gone wrong.

On a day when Repsol Honda team-mate Marc Marquez extended his perfect season to ten wins, Pedrosa crossed the line ten seconds adrift in fourth place.

"Today in the race I was trying to match the lap times, but I wasn't able to. I think overall something went wrong but I can't really tell what. It was just a weekend to forget," said Pedrosa, who had qualified just eighth for an event he won twice in the past.

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"I had a good start and basically I just tried to keep my race pace from practice, but I was struggling all weekend to get a good pace from the very first practice. I couldn't recover the gap on the bikes in front of me.

"It wasn't any one place [where I was losing time], it was just overall. I wasn't able to match the lap times. I pushed myself to the limit today and I got fourth. No, of course I wasn't happy with it, but that's the way it goes. I tried my best and my team tried its best to improve the bike.

"I can't say it was the bike's fault or my fault, because I don't know why."

The result means Pedrosa is now just four points clear of Valentino Rossi in the fight for second in the world championship.