Hillary Clinton is narrowly ahead of Bernie Sanders in Kentucky's Democratic US presidential primary with 99 percent of the vote counted.
The tight contest on Tuesday night (local time) was yet another demonstration of how divided Democrats are in the drawn-out race for the party's nomination.
With 99.8 percent of the vote counted, Clinton led with 46.7 percent of the vote to 46.3 percent for Sanders.
Kentucky was not considered favourable terrain for Clinton, after neighbouring West Virginia and Indiana both went to Sanders.
Clinton's ability to stave off a resounding defeat in Kentucky now gives her a little breathing room, as she looks forward to a lull in the primary campaign before the final contests on June 7.
Oregon also held its Democratic primary contest on Tuesday.