Watch: 19-year-old Angela Lee wins ONE title in thriller

At just 19 years of age, atomweight Angela Lee has been touted as one of MMA's most promising prospects. On Saturday, she captured her first major title with a unanimous decision win over Mei Yamaguchi in a "Fight of the Year" candidate at ONE Championship 42 in Singapore.

For 25 minutes, Lee and Yamaguchi engaged in a heated grappling battle that included a lexicon of submission techniques. From guillotine chokes to D'arce chokes, armbars to kneebars, and from one breathless scramble to another, the two fighters did everything in their power to earn a tap out.

All three judges scored the fight for Lee. The Canadian becomes the first female ONE champion and one of the youngest titleholders in professional combat sports today.