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GREENVILLE, S.C. (AP) -- Mitt Romney is heading into primary day conceding that he'll win some and lose some.

Romney on Friday acknowledged the contest here is "neck-and-neck" and said he expects to lose "some primaries" to rival Newt Gingrich, the former House speaker.

As voters head to the polls Saturday, the nature of the race has changed. The past week has been an abrupt reversal of fortune for the former Massachusetts governor, who landed here last Wednesday after a big victory in New Hampshire and what was then a narrow win in Iowa.

But this week the Iowa GOP reversed his win there after problems with the vote count, and he's been dogged by questions about releasing his tax returns. A loss Saturday would leave Romney with just one early state win.

Mitt Romney says he will attend the next GOP presidential debates in Florida, which is next up on the election calendar.

After last weekend's two debates in South Carolina, advisers to the former Massachusetts governor had said the candidate hadn't committed to any more campaign debates.

But Romney said Saturday, on the day when South Carolinians are voting in their state's GOP primary, that he will be at the Tampa debate, and advisers say he also will participate in the Jacksonville debate on Thursday.

His commitment to the debate might be a sign that he doesn't think he will do as well as first thought in South Carolina against rival Newt Gingrich and will need to continue the fight in Florida.

The Florida primary is Jan. 31.

(Copyright 2012 by The Associated Press. All Rights Reserved.)