While Amanda Nunes is most people's pound-for-pound number one amongst females, there's no doubting who completes the top two.
In fact, Nunes is the only fighter Valentina Shevchenko hasn't beaten in her career, and she remains undefeated at flyweight.
Read all you need to know about the UFC champion below.
Born 7th March 1988, Shevchenko is 34 years old.
Shevchenko's professional MMA record reads 26 fights, 23 wins and three losses.
Shevchenko is 5ft 5in.
Shevchenko uses a combined Peruvian-Kyrgyzstan flag at her fights. Shevchenko spent time in South America teaching Muay Thai, eventually gaining Peruvian citizenship, and was born in Kyrgyzstan to a Russian-Ukrainian family.
That remains the question. Prior to her defeat to Julianna Pena (which she avenged seven months later), Nunes looked unbeatable. She'd torn through the bantamweight division, then beating Cris Cyborg to become featherweight champion.
Shevchenko is similarly dominant at flyweight, but with all three of her pro defeats coming at bantamweight, she may opt to stay at the better-suited 125lbs.
Liz Carmouche - who Shevchenko eventually defended her UFC title against - handed the Ukrainian her first professional loss in her eighth fight back in 2010 upon her return to bantamweight.
She then lost twice in the UFC to Amanda Nunes before dropping back down to flyweight, where she's won nine straight fights.
Shevchenko beat Joanna Jedrzejczyk at UFC 231 for the vacant UFC women's flyweight championship. She's since defended the title against Jessica Eye, Liz Carmouche, Katlyn Chookagian, Jennifer Maia, Jessica Andrade, Lauren Murphy and Talia Santos.
Shevchenko defends her title at UFC 285 against Alexa Grasso on 4th March 2023.