Throughout her athletic career, Ronda Rousey has not only accomplished a lot, but she's also been the first to do so in several categories, from her days as an Olympian all the way until now as the only UFC women's bantamweight champion in history.
She was the first American to win a medal in women's judo in the Olympics with her bronze finish in 2008.
Rousey was the first woman to headline a UFC pay-per-view with her bout against Liz Carmouche at UFC 157 in 2013.
Just recently, Rousey became the first mixed martial artist to grace the cover of boxing's Ring Magazine, and on Friday she was named as the first woman to land the global cover of an EA Sports video game with her spot on the front of UFC 2 coming out in 2016.
Rousey hasn't just done a lot during her career -- she's been the first to do many of the things that she holds so proud, but which achievement rates at the top of the list?
"I'd have to say my favorite first is being the first ever UFC women's champion," Rousey told FOX Sports in a recent interview.
Rousey was actually the Strikeforce women's champion before the division was shifted over to the UFC, and while she was given the belt upon her arrival, she didn't feel it was real until she faced Carmouche at UFC 157.
The fight also stands as one of Rousey's toughest tests, as Carmouche latched onto her back early in the first round and worked for a rear naked choke that nearly ended the fight. Eventually, Rousey shook Carmouche loose and ended the fight with her signature armbar submission just seconds before the round came to an end.
While Rousey is certainly proud of all her accomplishments, especially winning a medal in the Olympics, becoming the first women's UFC champion is something she'll never ever forget.
It's also the moment when Rousey went from a well-respected fighter to a household name, as she's become the most popular competitor on the UFC roster.
"I guess being the first woman UFC champion is the one that took the most work and the one that resulted in everything else," Rousey said.
"I would say being the first American woman to win an Olympic medal in judo, but that's only a technical accomplishment because there were women Olympic medalists in judo in 1988 but judo wasn't a fully recognized sport for women in the Olympics yet."
When Rousey steps into the Octagon to face Holly Holm on Saturday night at UFC 193, she will look for her seventh straight title defense, which would put her just three fights behind Anderson Silva for the all-time record in the UFC.
She's already the first and only women's bantamweight champion, but to break Silva's record in the next year or two would add yet another accolade to Rousey's growing record of accomplishments.