M35-39 Half Marathon: Guerrero seizes command in San Francisco

• Christopher Guerrero, 1:18:57 (6:01/mi) — won M35-39 by nearly 8 minutes over Oleksandr Skorokhod's 1:26:50.
• Tightest battle of the day: Jaehyun Park (1:27:21) edged Tobias Patella (1:27:23) for 3rd by just two seconds.
• 298 finishers completed the M35-39 race in San Francisco's cool, humid 54°F morning.
• Skorokhod to Park: a 31-second gap separated 2nd from 3rd; Park to Patella was nearly nothing — two seconds across 13.1 miles.

Christopher Guerrero, 38, from Salinas, ran a race that was over almost before it began. He moved from 2nd to 1st in the men's field through the opening miles and never looked back, posting the fastest split on the 2.2M–5.7M segment among all men. His 6:01/mi average held firm through the finish, and his 1:18:57 stood nearly eight minutes clear of anyone else in M35-39 — a margin that speaks for itself on a hilly San Francisco course in thick, humid air.

Behind Guerrero, Oleksandr Skorokhod, 37, of Atherton claimed 2nd in 1:26:50 (6:37/mi), posting the 7th-fastest men's split on that same 2.2M–5.7M stretch. He ran a composed, consistent race — holding a position in the mid-pack of the men's field throughout and finishing 11th among men overall. But the real drama in M35-39 was one place back: Jaehyun Park, 36, of San Jose crossed in 1:27:21 after a strong surge through the middle miles — he climbed from 36th in the men's field at the first checkpoint all the way to 12th by the back half, posting the 11th-fastest men's split on the first half of the course. That charge was just enough to hold off Tobias Patella, 38, of San Francisco, who finished 4th in 1:27:23. Patella had been the faster early mover — sitting 7th in the men's field through the opening stretch — but Park's mid-race acceleration proved the difference, with two seconds separating them at the line.

Joseph Tam, 38, rounded out the top five in 1:28:55 (6:47/mi), and then a notable gap opened before Ryan Birch, 35, crossed in 1:32:30 to lead the next wave. Bruno Botelho (1:32:37), Nihn Huang (1:33:42), Sean Thon (1:34:37), and Nicholas Buckmaster (1:35:19) filled out the top ten across 298 finishers — a deep, competitive M35-39 field that made every second count.