In 2010 Langat won the prestigious Diamond League tally for the 1500 m. She went undefeated in all of her races against the best runners in the world. He performance at the 2010 IAAF Continental Cup was a controversial one, as she attempted to pull back Hind Dehiba as the two duelled in the final straight. Langat fell and finished last. She claimed an 800/1500 m middle distance double at the 2010 Commonwealth Games, however, and was chosen as the Kenyan Sportswoman of the Year in December.