World Athletics has adjusted its rules to allow both Josh Kerr and Jakob Ingebrigtsen to compete in the 1,500m at the Ultimate Championships. The decision expands the field to 13 runners, setting up a highly anticipated showdown.

The Ultimate Championships, starting Sept. 11 in Budapest, Hungary, will see Kerr and Ingebrigtsen face off in the 1,500m. Both athletes have a history of competing against each other, with Ingebrigtsen winning the 2021 Olympic title and Kerr claiming the 2023 world championship. Read more racing coverage.

Kerr, who recently broke the mile world record, and Ingebrigtsen, returning from injury, are both eager to prove themselves in the biggest races. Their upcoming race in Budapest promises to be one of the most compelling rivalries in the sport. Related: Kerr and Ingebrigtsen to Clash in Ultimate Championship 1500m.

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