San Francisco Marathon: Luca Fox Claims NB20-24

• Sole finisher and winner: Luca Fox, 24, San Francisco — 4:12:45 (9:38/mi avg)
• Early spark: Posted the 6th-fastest women's split on the 2.2–5.7 mile segment across the entire women's field
• Race arc: Held 6th among women through the middle miles before gradually settling to 10th by the finish

Luca Fox had the NB20-24 field entirely to herself on a cool, damp San Francisco morning — 54°F and 94% humidity as the city's iconic fog kept temperatures in check. One finisher means one winner, and Fox crossed in 4:12:45 at a 9:38/mi average to claim it outright.

What makes Fox's run worth a closer look is what happened in the early going. On the stretch from mile 2.2 to mile 5.7, she put up the 6th-fastest women's split across the entire women's field — a genuine burst of pace that had her sitting 5th among women at that checkpoint. She held 6th through a long stretch of the middle race before the back half of the course took its toll, and she came home 10th among women at the finish. The fade is real, but that early split tells you the legs were there.

Fox's 4:12:45 stands as the NB20-24 mark for the day — uncontested, but earned on one of the more demanding urban marathon courses on the calendar.