In a thrilling upset at the World Athletics Championships, Kenya’s Lilian Odira stunned the field to win the women’s 800 meters gold medal, setting a new championship record and cementing a historic run of dominance for Kenyan women in distance running.

Odira, a 26-year-old mother of two, was considered an underdog with a personal best of 1:56.52 before the championships. However, she found a new gear in the final straight, surging past a star-studded field that included Olympic champion Keely Hodgkinson of Great Britain.

In a race that will be remembered for its depth and speed, Odira stopped the clock at 1:54.62, a massive personal best that took down the oldest championship record in the books—Jarmila Kratochvílová’s 1:54.68, set in 1983.

The final was a tactical masterpiece, with defending world champion Mary Moraa of Kenya leading for the first 600 meters. Hodgkinson, a strong favorite for gold, made her move on the final turn and hit the straight in front. But the British star was outmatched by the finishing kicks of two other athletes—her training partner Georgia Hunter Bell and, ultimately, Odira.

Hunter Bell took the silver in a personal best of 1:54.90, while Hodgkinson settled for the bronze in 1:54.91. This was the first time in history that three women have broken 1:55 in the same race, and the first time that five have broken 1:56.

Odira’s win adds another gold to Kenya’s incredible haul at the championships, with Kenyan women winning every event from the 800m to the marathon. The list of Kenyan champions includes Faith Kipyegon (1500m), Beatrice Chebet (5000m and 10,000m), Faith Cherotich (3000m steeplechase), and Peres Jepchirchir (marathon).

“This is my first World Championships and I am really grateful to be leaving it as the world champion,” said a jubilant Odira. “This medal means the world to me. It is for my sons, they are four and two. They are my motivation.”