"I hadn't even realized at first but this has been my best start to a season ever," said Castroneves, who is still seeking his first series title. "I made a mistake in the first race, I should have won that one. But we have been really consistent."
Castroneves was second in the season opener in St. Petersburg, losing the lead to Hinchcliffe after a poor restart in the final laps. The Brazilian finished third in Alabama and managed a 10th-place finish in Long Beach despite having to make an extra pit stop to replace a damaged front wing.
Castroneves is one of only three drivers with top-10 finishes in all races this year.
The three-time Indy 500 winner hasn't had great success in Sao Paulo in the past, but he has two top-five finishes on the Anhembi track. His best finish was fourth last year. In 2011, he was involved in a series of incidents and came 21st, and in the inaugural race he was fifth.
Being at home, he knows the motivation will be there no matter what.
"Coming to Brazil it's always nice because of the support from the public," he said.
Tony Kanaan is another fan favorite in Sao Paulo, but he still isn't sure whether he will be able to race on Sunday after injuring his right hand in the final laps of the race in Long Beach.
"I'm optimistic," he said. "But I still don't know how it's going to be. We will have to wait until I get in the car tomorrow (Saturday.)"
If he is able to start on Sunday, it will be Kanaan's 200th consecutive race in the series, second only to Jimmy Vasser's 211.
Follow Tales Azzoni at http://twitter.com/tazzoni