SF Marathon 5K — NB35-39: Xu Owns the Field

• Cheng Xu claimed the NB35-39 win in 31:08 (10:01/mi avg).
• The 37-year-old San Francisco local was the sole finisher in the NB35-39 field.
• Race day brought cool, humid conditions — 57°F and 85% humidity under overcast skies.

Cheng Xu crossed the finish line in 31:08, averaging 10:01 per mile to take the NB35-39 title on home turf in San Francisco. With the city's overcast skies and damp morning air keeping temperatures in the mid-50s, conditions were about as runner-friendly as the Bay Area gets in late July.

As the only finisher in the NB35-39 field, Xu had the category entirely to himself — but a finish is a finish, and a win is a win. He covered the 5K course and put a number on the board, which is exactly what race day is about.