"He manhandled me in rehearsals from the start, pushing me, whacking my stomach, bending my arms roughly," the Olympian, 31, writes in Solo: A Memoir of Hope.
"I thought that was just how it went – how dancers worked with each other," she continues. "But it kept getting worse. ... One day, Maks was trying to put me in a certain position and hit my stomach so hard with his open palm that I had a red handprint there for the rest of the day."
Solo, goalie for the gold medal-winning U.S. women's soccer team at the 2012 Summer Olympics, says that ABC offered her a new pro partner after Chmerkovskiy slapped her during rehearsal for the show's 2011 Halloween episode.
"He wanted my head in a specific position. To achieve that, he slapped me across the face. Hard," she writes, according to USA Today.
She declined a new partner, she says, because "she didn't want to end [his] career."
Chmerkovskiy, 32, hasn't commented on the book but did post this message on Twitter Thursday: "Always hated hypocrites and liars ... but when someone is both AND an opportunist, I just feel bad for them. Can't win at someone's expense ..."
ABC has not yet commented on Solo's allegations, and Chmerkovskiy's rep had no comment.