Australia's Bree Walker is on the hunt for the inaugural Olympic monobob gold medal after being among the quickest at practice at Yanqing National Sliding Centre.
The former 400m hurdler had the second fastest times after two official runs on Saturday, putting her among the medal favourites with the first two heats of racing getting underway on Sunday.
The medals are decided following the final two heats on Monday.
Walker was seventh after the first practice run behind Laura Nolte and then improved to second by the end of the second run, with the German still the pace-setter.
American Elana Meyers Taylor, the world series champion, improved from ninth to fourth fastest over the two runs.
A three-time Olympic bobsleigh medallist, Meyers Taylor had a chaotic lead-in after testing positive to COVID-19 in Beijing and being forced into isolation, unable to train.
Walker, from Melbourne, was thrilled with how her preparation was unfolding.
"I feel like everything has come together over the last few days," the 29-year-old said.
"We're trying out a few things to fix a few corners, and it's all worked out.
"I've pretty much figured out all the corners, it's about putting the pieces of the puzzle together."
The monobob, a one-driver sled event, was added to the Olympic schedule in the hope of luring countries who didn't have an established bobsleigh program to compete.
In the women-only event, competitors race in identical sleds to remove the impact of expensive technology on the race result.
Walker, who turned to winter sports in 2016, has been one of the top contenders in the monobob World Cup series all winter in Europe.
She eventually finished fifth in the series but only after one bad run in Switzerland on the final day.