It was just an early March day at the office for Matt Harvey Saturday, with 2 2 /3 innings of work refining his pitches.

With temperatures in the mid-50s, Harvey made his second Grapefruit League start, allowing a leadoff home run to Marlins prospect Christian Yelich, but no other runs. At this point in the spring, many pitchers focus more on refining certain pitches than on results.

For the intense Harvey, it is “a little bit of both. Obviously, that competitive edge doesn’t want to give up any hits or home runs or anything like that, but at the same time it’s throwing some pitches I wouldn’t normally throw in certain counts.”

For example, Harvey lost his feel for the changeup in the third inning, and threw several in a row, despite a situation that did not call for it.

“It was something I was really trying to work on,” he said. “Normally, I would go to the fastball there.”

Harvey’s main project this spring is to develop his curveball, a pitch that did little to help him during his rookie year in 2012.