Canada enters the final day without a medal, despite strong performances. Chloe Symon's sixth-place finish in the women's 800m was Canada's best result so far. The women's 4x100m relay team and high jumper Amairah Gayle are medal hopefuls.

The women's 4x100m relay team, featuring top Canadian sprinters, qualified with a season-best time. They need a personal best to compete for a medal. High jumper Gayle has a personal best of 1.83m, but faces tough competition. Read more racing coverage.

Day 4 saw world records and technical excellence. Italy set a new world U20 record in the mixed 4x100m relay. Le'Ezra Brown of the U.S. won the men's 110m hurdles with a world U20 record time of 12.72 seconds. Related: British athletes shine at World U20 Championships in Oregon.

This original Runner World brief is based on reporting from Canadian Running. Visit the source for its complete reporting, context and any later corrections.