Bolt & Gatlin set up 200m showdown
World 100m champion Usain Bolt and silver medallist Justin Gatlin will race each other again after they both qualified for Thursday's 200m final.
Great Britain's Zharnel Hughes, 20, will also have the chance of winning his first major medal having won the first semi-final in 20.14 seconds.
Jamaica's Usain Bolt eased to 19.96 to claim his spot in the final.
Rival Gatlin of the USA, whose 19.57 in Eugene is the fastest 200m this year, ran 19.87 to win his race.
Britain's 100m champion and national record holder Dina Asher-Smith ran a superb personal best of her own of 22.22 to move into the semi-finals of the women's 200m.
The 19-year-old made light of her inside lane to run a splendid bend and then held her form down the straight to go close to Kathy Cook's 31-year-old British record.
"I'm really, really happy," Asher-Smith told BBC Sport. "I didn't expect to run a PB in the heats."
That time made Asher-Smith the fastest qualifier by more than two tenths of a second.
Asher-Smith will be joined in Thursday's semi-finals by her team-mates Margaret Adeoye and Bianca Williams, but former world champion Veronica Campbell-Brown is fortunate to progress with them after running out of her lane off the band.