B.A.A. 10K M15-19: Kosiba Runs Away From the Teen Field in Boston's Heat

• Andrew Kosiba, 16, wins M15-19 in 38:16 (6:10/mi), finishing nearly a minute clear of runner-up Emery Young's 39:04.
• Tight battle for 4th and 5th: Benjamin Tatham and Alexander Kehayias both clocked 39:38–39:39, separated by a single second.
• Kosiba's late surge: He moved from 170th to 118th among men in the men's field across the race, climbing 52 spots in the second half alone — the strongest finishing kick in the group.
• Wesley Lawless and Joaquin Villena, both running sub-7:00 pace, were separated by just one second (43:15 vs. 43:16) in a tight battle for 10th and 11th.

Running 6:10 per mile through 93°F Boston heat with a 15 mph wind, 16-year-old Andrew Kosiba from Dunstable, MA, delivered the dominant performance of the M15-19 group. His 38:16 wasn't just a comfortable win — it was a statement. He progressively climbed through the men's field as the race wore on, moving from 170th among men at the first checkpoint all the way to 118th by the finish, posting the 59th-fastest split in the field on that final 8K-to-finish stretch. In conditions that punished anyone who went out too hard, Kosiba got stronger.

Emery Young of Bethlehem, NH, claimed 2nd in M15-19 with a 39:04, holding reasonably steady through the men's field across all three checkpoints. Gianluca Uglialoro, also 16, rounded out the podium in 39:22 but told a different story — he was as high as 135th among men at the 5K mark before fading to 158th by the finish, suggesting the heat took a toll in the back half.

The race for 4th was as close as it gets without a dead heat. Benjamin Tatham (39:38) and Alexander Kehayias (39:39) were separated by one second, but Kehayias's route to that finish was the more dramatic one — he entered the 5K-to-8K segment ranked 222nd among men and clawed all the way back to 174th, the biggest climb of any athlete in the top five.

Further back, the field spread out considerably in the heat, with 52 finishers completing the course. The one-second gap between Wesley Lawless and Joaquin Villena at 10th and 11th — 43:15 to 43:16 — was one of the day's tightest margins, a fitting footnote to a race where every second in those conditions was hard-earned.