Britain’s Dina Asher-Smith ran a season’s best time to reach the 200m final and continue her title defense at the World Championships in Oregon.
Asher-Smith clocked a time of 21.96 to finish the rapid semi-final a hundredth of a second behind American Tamara Clark.
“I’m really happy with it. The field is so wide open and the quality is so high,” she told BBC Sport.
Jake Wightman later took Britain’s first gold at the Championships with a stunning 1500m win.
Britain have so far won two medals at the event after Laura Muir won bronze in the 1500m on Tuesday.
“We knew we had to do really well here, so I was really happy to finish second,” said Asher-Smith, 26.
“I’m glad we have a day off so I can rest, recover, focus and get ready again, just a little faster.”
Such was the quality of the 200m that American Jenna Prandini missed out on the final despite running 22:08 – a time that would have qualified for any previous final.
All three semi-finals were fast and set the stage for a fascinating final on Thursday.
Shelly-Ann Fraser-Pryce, Shericka Jackson and Elaine Thompson-Herah, who clinched a Jamaican double in the 100m final earlier this week, all came through.
Jackson was the fastest of any qualifier at 21.67, while world 100m champion Fraser-Pryce ran 21.82.
Olympic gold medalist Thompson-Herah was edged out by Asher-Smith, but her time of 21.97 was enough to qualify as one of the fastest runners-up.
“The final will be hot,” said four-time Olympic sprint champion Michael Johnson on BBC television.
“Shelly-Ann ran just above her personal best to get into this final, Dina ran well…it’s going to be fantastic.”
Great Britain Jessie Knight qualified for the 400m hurdles semi-final in 55.48 though Lina Nielsen lost.
Nethaneel Mitchell Blake and Joe Ferguson did not reach the men’s 200 m final and finished fourth and seventh in their respective semifinals.
Dos Santos ends Warholm’s reign
of Brazil Alison dos Santos ran the third-fastest men’s 400-meter hurdles time in history, taking gold and ending Karsten Warholm’s bid for a third straight world title.
Dos Santos posted a championship record of 46.29 to beat American duo Rai Benjamin and Trevor Bassitt.
Norway’s Olympic champion Warholm started strong but seemed to falter towards the end of the race and only finished seventh.
Olympic champion and world record holder Sydney McLaughlin from the United States reached the 400m hurdle semifinals, winning her run in 53.95.
US title holder Dalilah Muhammad also advanced, with 54.45 hours, as did the bronze medalist from Tokyo Femke Bol the Netherlands.
Noah Lyle set a mark of 19.62 seconds in the men’s 200m to qualify alongside the Olympic silver medalist as fastest for the final Kenneth Bednarek.
However, a fellow American and 100-meter champion Fred Kerley was only able to finish sixth in his semifinals after suffering from cramps.