F30-34: Chemutai dominates Chicago's heat while Romero and Righeimer write their own return stories

• Joyline Chemutai won the F30-34 age group in 1:11:45 (5:28/mi), holding 1st among women from wire to wire and posting the fastest women's split on the 5K→8K segment.
• Mao Kiyota closed in 1:13:00 with the fastest women's split on the 15K→finish — a 1:15 gap back to Chemutai, but a powerful late surge that lifted her from 4th to 3rd among women by the finish.
• Britney Romero (6th, 1:27:00) and Vanessa Righeimer (7th, 1:27:06) finished just six seconds apart — and both are Chicago 13.1 veterans with real history here.
• A field of 740 finishers in the F30-34 age group braved 79°F temperatures and a 20 mph wind that made every minute of pace feel earned.

Joyline Chemutai was never seriously threatened. She led among women at every checkpoint — 5K, 8K, 10K, 15K, and the finish — and her fastest women's split on the 5K→8K stretch signaled early that this was her race to lose. Running 5:28/mi in that heat is a statement. Mercy Lagat (3rd, 1:18:05) also showed early speed with the 6th-fastest women's split on the 5K→8K, but faded from 6th to 9th among women through the back half, finishing 3rd in the age group at 5:57/mi.

Kiyota's story ran in the opposite direction. Sitting 4th among women through 15K, she unleashed the fastest women's closing split from 15K to the finish, moving to 3rd among women and crossing in 1:13:00. It was a textbook negative-split finish and the best performance of the day behind Chemutai. Heather Stevens (4th, 1:22:44) also had a strong close — the 13th-fastest women's split on that same 15K→finish stretch — and climbed from 22nd among women at the opening checkpoint all the way to 17th by the line.

Then there's the Chicago 13.1 veterans' corner. Romero finished 6th here in 2022 in 1:18:57; this year she crossed in 1:27:00. Righeimer, meanwhile, has now raced this event three consecutive years: 9th among women in 2022 (1:21:27), 8th in 2023 (1:25:01), and 7th in this year's F30-34 group in 1:27:06. Six seconds separated them at the finish line — a fitting footnote for two runners who clearly keep coming back to Chicago with something to prove.