Defending champion Katarina Johnson-Thompson said she feels "excited" to resume her bid for a third world heptathlon title after putting herself into medal contention in Tokyo.
Johnson-Thompson will begin the final day of the competition in third place on 3893 points, with American Anna Hall leading the standings at the halfway stage (4154 points) ahead of Ireland's Kate O'Connor (3906 points).
Belgium's Nafi Thiam, who beat Johnson-Thompson to Olympic gold last year, is sixth (3818 points) after ranking eighth across Friday's concluding 200m races.
The heptathlon resumes with the long jump on Saturday morning (03:35 BST), before the javelin (11:00) precedes the deciding 800m (13:11).
"It was a tough timetable today, I'm not going to lie. Normally we have the full day to spread out the events but it was back-to-back-to-back, which shows in the 200m times for everyone," Johnson-Thompson told BBC Sport.
"A solid first day for me, I've had a lot worse and I've had a lot better. I just need to go home and recover and come back tomorrow.
"My day two has got better in recent years, two of my best events are day two so I'm excited for tomorrow."