Bryson DeChambeau and Jon Rahm are known for their towering drives but they won’t make it to the tee box at the Olympics.

Ahmed Hafnaoui of Tunisia was the surprise winner of the 400-meter freestyle at the Tokyo Olympics, beating a field of faster and older swimmers.

Irvine is hosting about 240 swimmers — a mix of national team members, collegians and high schoolers — competing outdoors under strict safety guidelines at a time when COVID-19 is surging again in many parts of the country. Ryan Lochte, seeking to make his fifth Olympic team at age 36, is competing at the U.S. Open site in Sarasota, Florida. Swimmers enter the complex through a designated spot and follow a progression from the warm-up pool, competition pool, warm-down pool and exit. The number of swimmers who can be in the same lane training at the same time is limited to a maximum of four. Multiple sessions are being staged to keep the number of swimmers at the complex at one time lower.