From The Enquirer:
Sarah hooked up with the NBA great, then a 6-foot-8 junior at the University of Michigan when he was playing in a college basketball tournament in Alaska in 1987, the book says. At the time, Sarah, just out of college, was working as a sports reporter for the Anchorage TV station KTUU.
There's also this:
A publishing source told The Enquirer that McGinniss claims Sarah had a "fetish" for black men at the time and he quotes a friend as saying Sarah had "hauled (Rice's) ass down."
Rice played in the NBA from 1989-2004, making three All-Star teams.
The alleged one-night stand went down seven months before she got married to Todd Palin — though he was still "very much in the picture" at that time.