"in one swing" is correct and can be used in written English.
It can be used to mean to do something in one quick, single motion or with little effort. For example: "With one swing of the bat, the batter sent the ball over the fence for a home run."
Instead, in one swing state, a small portion of the vote captured by Nader may have cost Al Gore the election.
That probably wouldn't cover the costs of television ads in one swing state, let alone fund an entire campaign until the next debate.
(That is, if Mr. Obama underperforms his polls in one swing state like Ohio, he is also more likely to do so in similar ones like Iowa).
That narrow miss by Djokovic had sealed Murray's first Grand Slam title, forever changing his career and reputation all in one swing, all by a mere inch.
But Peter Hedblom of Sweden, a 36-year-old European Tour player with one career victory — the 1996 Moroccan Open — put himself in contention with one swing at No. 3. His 3-iron shot landed just in front of the green, rolled on and curled into the hole.
Seeing that one pitch from Chan Ho Park of the Los Angeles Dodgers at the start of the third inning, Ripken took that one swing and drove the ball over the left-center field fence.
It is dead, felled in 1951 by one swing of Bobby Thomson's bat.
On a day when Mets starter Oliver Perez allowed six runs in the first inning, the Mets were in a position to win in the ninth with one swing of the bat, only to be thwarted by one of the rarest plays in baseball.
Snow, who had only six homers in 143 games this season, created his fondest memory here with one swing in the sixth.
His other chances to win had been sabotaged by poor run support, but Alfonso Soriano changed that with one swing in the sixth.
Speaking to the potential for waste, fraud, and abuse, one swing participant in our Manassas, Virginia session expressed her concern that "people are taking advantage of the welfare system and it needs to be reformed".
