O'Keefe claimed six batsmen in each Indian innings to end up with figures of 12 for 70, paving way for his side's 333-run victory in the first Test.
"I didn't think it was going to turn out the way it did today. One of the things from bowling for a lot of time is that you build up a lot of belief. When you've got good structures around you with the captain and the coaching staff, you're going out there feeling confident in your own ability. And that's an important place to be out there particularly as a spinner," O'Keefe said at the press conference.
O'Keefe said he was actually relieved that he could contribute in his side's first win in India after such a long period.
"Probably relieved, it's the main one. It was a long time coming, a lot of preparation has gone into this one before we travelled over here. We went to Dubai before coming to Mumbai. So I am just relieved with the position that we're in, 1-0, and to personally take some wickets. It gives me a lot of confidence going forward."
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"Nathan and I enjoy bowling together, we've done it for a long time. We've done it unsuccessfully and we've done it successfully. The best thing about Nathan is that he takes that in his stride and we're willing to communicate in how we can improve and we do that throughout the match.
"We've got a good relationship, and that's going to be important going forward," said the 32-year-old bowler who played in only his fifth Test.
But he did not expect smooth sailing in the remaining matches.
The man-of-the-match bowler's analysis is the second best for an overseas bowler in India, after Ian Botham's 13 for 106 in the Golden Jublilee Test at Mumbai's Wankhede Stadium in 1980.
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