Great Britain's Christine Ohuruogu made smooth progress into the 400m semi-finals on day one of the World Athletics Championships in Moscow.
The British team captain, 29, won the second heat in 50.20 seconds - her second-fastest time of 2013.
Eilish McColgan qualified for the 3,000m steeplechase final, while Michael Rimmer and Andrew Osagie made it through to the 800m semi-finals.
Shara Proctor qualified for the long jump final with the best jump of 6.85m.
"I was able to watch the last jump and I couldn't believe how far behind the board I was," Proctor told BBC Sport.
"I won't to get too comfortable, but I am aiming for the stars and the moon."
McColgan had struggled with a shin injury in the build-up to Moscow but battled to a Scottish record and personal best of nine minutes 35.82 seconds to qualify for Tuesday's steeplechase final.
"I'm so happy," she said. "I honestly couldn't have asked for any more today. Just to be at the start line after the year I've had with injury.
"I knew I was catching them the whole way and I've run a PB, so it was worth all those months of lying around."
Rimmer and Osagie made it through to Sunday's semi-finals of the 800m after both finished third in their heats, Rimmer clocking 1:45.47 and Osagie 1:46.16. Ethiopian Mohammed Aman qualified fastest in 1:44.93.
"These heats aren't easy," Rimmer told BBC Sport. "I'm through it and I can have a really good go on Sunday. I'm not scared of anyone."
Steve Lewis failed to qualify for the final of the pole vault, and fellow Briton Ashley Bryant withdrew from the decathlon before the 100m because of a hamstring problem.
"Unfortunately I got a grade one hamstring tear last week. I knew I'd be up against it to recover but I thought I had a good chance because it was in good shape in the last few days, so I was hopeful," Bryant said.
"In warm-up today when I had to push it that bit more it wasn't ready for the competition. I'm gutted, but that's sport I guess."
Lewis was unsuccessful with three attempts at his opening height of 5.40m.
Edna Kiplagat of Kenya became the first woman ever to retain the world marathon title as she won in 2:25:44, ahead of Italian Valeria Straneo and Japan's Kayoko Fukushi.
Scot Susan Partridge finished 10th in 2:36:24 and England's Sonia Samuels came 16th in 2:39:03.