Jamaican Elaine Thompson-Herah is on course to complete a sprint double after equalling her personal best to qualify for the women’s 200m final.
The 100m champion clocked 21.66 seconds to lead the qualifiers for the final with silver medallist Shelly-Ann Fraser-Pryce also safely through.
British pole vaulter Holly Bradshaw reached her final after a rain-interrupted qualification.
Laura Muir and Katie Snowdon advanced to the semi-finals of the 1500m.
Thompson-Herah looked impressive in her race but in the final, as well as Fraser-Pryce, Marie-Josee Ta Lou of Ivory Coast and impressive Namibian teenagers Christine Mboma and Beatrice Masilingi will all challenge.
Beth Dobbin, Britain’s sole representative in the event after Dina Asher-Smith’s withdrawal through injury, finished fifth in her semi-final in 22.85 secs.
The 100m bronze medallist Shericka Jackson failed to make it to the semi-finals after dramatically easing down too soon in her heat, missing out on qualification by four one-thousandths of a second.
In a dramatic moment, world 1500m champion Sifan Hassan fell with 400m to go but won her heat in 4:05.17.
The Dutchwoman, who was born in Ethiopia but represents the country where she arrived as a refugee aged 15, later went on to win gold in the 5,000m final to complete the first part of a 1500-5,000-10,000m treble.
In the pole vault, Bradshaw, who is aiming to win her first major championship medal outdoors, needed just one attempt at 4.55m to secure her place in Thursday’s final.
Source: BBC