The dollar slipped against the yen in late trade on Friday ahead of elections for Japan's upper house Sunday which could add momentum to Prime Minister Shinzo Abe's aggressive push for monetary easing to lift growth and fight deflation.
Earlier the dollar held near a one-week high against the yen but as trading slowed ahead of the weekend, the U.S. currency gave up gains.
Opinion polls show Abe's ruling Liberal Democratic Party and its New Komeito Party coalition partner are on track to win a hefty majority this Sunday. That would give him more freedom to push his agenda of monetary easing, public spending and structural reform, which could weigh on the yen.
"What appears to be clear, barring any sharp surprises in the outcome, is that Mr. Abe is likely to consolidate his power and maintain course for an accommodative fiscal and monetary policy," said Boris Schlossberg, managing director of FX Strategy at BK Asset Management in New York.