Moments after piloting Untapable to victory in Friday's Longines Breeders' Cup Distaff at Santa Anita Park, jockey Rosie Napravnik announced her plan to retire from riding races.

The 26-year-old rider, who is married to trainer Joe Sharp, said she and her husband are expecting their first child.

"I've been planning my retirement since I found out that I was pregnant; I'm seven weeks pregnant," Napravnik said. "Joe and I decided this summer to stop trying not to have children, and we didn't know whether it would take a month or a year. It didn't take very long. So it wasn't completely unexpected, and when I found out and I worked out the timing, I said, 'I'll be seven weeks at Breeders' Cup? Perfect.'

"My plan was to wait until after the weekend, and I don't know if I'd won on another horse if I would have said anything, but this filly has just been very special to me and it's a very special way to go out, so I just had to say it since they asked me how much it meant to me."

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Napravnik is the nation's leading female rider and currently is sixth among all jockeys in North America by earnings in 2014 with $12.07 million. She is a two-time winner of the Kentucky Oaks, having taken this year's edition on Untapable along with the 2012 running on Believe You Can.

In 2012, she broke Julie Krone's total wins and earnings record for a woman. She is the only woman to have ridden in all three Triple Crown races.

Napravnik said she plans to assist Sharp in his fledgling operation. The former assistant to Mike Stidham and Mike Maker went out on his own this year, and has a 9-3-1 record from 19 starts.

"My actual plan for the near future is, I'm going to be working in the barn with Joe. He started training on his own, his training career is thriving already, and his stable tripled in size in the first month and a half," the jockey said. "He's getting more and more calls, and the sky's really the limit for his career.

"It's great timing to be there and support him so I'm going to be working in the barn, which is something I've really missed, doing the actual hands-on horsecare rather than just hop on, hop off, so I'm really excited and I'm still going to be very much involved in the racing."