So you think you know everyone's favorite softball sister duo? We're betting you don't know half of this list we've compiled on Sierra and Sydney Romero! 

Want to know more about them? Watch FloSoftball's original two-part documentary, Bragging Rights: The Romeros.

1. They were the first sister duo to play on Team USA in the history of USA Softball.

[tweet url="https://twitter.com/syd_syd2/status/616474079323815936" hide_media="0" hide_thread="1"]

In 2015, Sierra played on the National Team and Sydney played on the Junior National Team.

2. Sierra was a top-three finalist for USA Collegiate Player of the Year both her sophomore and junior seasons.

She was named espnW's Player of the Year her junior year.

[tweet url="https://twitter.com/espnW/status/598189843911471104" hide_media="0" hide_thread="1"]

3. Sierra, Sydney, their little sister Sophia and their mother all share the middle name "Joy." 

Melissa Romero gave all three of her daughters the same middle name because, according to Melissa, "I wanted my girls to always have a little piece of me." All four women will eventually have matching hibiscus tattoos with "Joy" spelled out in the flower.

4. The sisters played one year of high school softball together at Vista Murrieta High School.

[instagram url="https://www.instagram.com/p/BBK03krOw1aVW6vDkgJNn7VD1y3kwVOfO8Li_40/?taken-by=wolverinesoonermomof4" hide_caption="0"]

5. Sydney passed up her high school graduation to play for Team USA, so Patty Gasso and Oklahoma threw her a personal graduation ceremony.

[instagram url="https://www.instagram.com/p/3zrX-1uw9GQ7i4E3lErQp9IJAEtFtHrwgjVHk0/?taken-by=wolverinesoonermomof4" hide_caption="0"]

6. Sierra is the clean and organized sister; Sydney is the messy one.

7. Both sisters hate scary movies.

8. Sierra's first collegiate home run was a grand slam. It was also her second collegiate hit.

9. Sierra is the NCAA career record-holder for grand slams. She currently has 11.

If that's not enough, she holds the following Michigan career records (as of 4/12/16): Batting Average (.447), RBIs (281), Home Runs (75), Runs (276), Slugging % (.898), and Walks (201).

10. But Sydney has the better high school stats.

11. The Romeros are an athletic family. Their dad, Mike, played baseball at San Diego State.

I mean, just look at all those #RomBomb swings!

12. And their brother, Michael, is rumored to be the best athlete in the family. He plays travel baseball for the San Diego Show.

[instagram url="https://www.instagram.com/p/BBBbpISuw2nNK57q_zOKNSQIgQU6p48T0Jixds0/?taken-by=wolverinesoonermomof4" hide_caption="0"]

13. Sierra will be the second Romero in her family to graduate from college, and Sydney will be the third. Their dad was the first.

14. Sydney wanted to play on Sierra's team so badly when they were young that Mike and Melissa had to get Sydney a matching uniform even though she was too young to play on the team.

15. The sisters have vastly different tastes in music. Sierra likes hip-hop, but Sydney is all about country.

16. Sydney hates to shop, but Sierra loves it!

17. If Sierra is named an All-American this season (which, duh?), she will be Michigan's first-ever four-year All-American.

[tweet url="https://twitter.com/umichsoftball/status/603755960876806144" hide_media="0" hide_thread="1"]

18. Sydney earned the nickname "Simba" from her dad because of her uncanny resemblance to 'The Lion King' character.

[instagram url="https://www.instagram.com/p/5--_8NKHnw/?taken-by=mlromero6" hide_caption="0"]

19. The Michigan vs. Oklahoma game at this year's Mary Nutter Collegiate Classic may be the only time Sierra and Sydney play against each other in college unless the Wolverines and Sooners meet in the postseason.

Who else wants to see a Michigan vs. Oklahoma final in the Women's College World Series?!

Related:

Watch Sierra and Sydney square off in a slugfest at Mary Nutter

Sierra Named the Greatest Wolverine in the History of Michigan Softball

Deconstructing the #RomBomb swing