WASHINGTON (MarketWatch) -- The U.S. trade deficit narrowed by almost 10% in May and this could help the second quarter look a lot better than expected. The trade gap fell 9.8% to $26.0 billion in May, the Commerce Department estimated Friday. This is the lowest level since November 1999. Exports revived a bit due to the slumping dollar and export demand from China. Economists were blindsided by the improvement. They had expected the familiar pattern during this recession to continue with the deficit widening to $29.4 billion. The surprise improvement could mean second-quarter gross domestic product will be much less negative than expected.