Una O'Brien ha affrontato 81 avversari durante tutta la sua carriera.

Player Team(s) Games
Sanja Aksam 1
Alma Alisic
U16 Austria (W) (Euro U16 B)
1
Ljube Andric 1
Gergana Bachkova
U16 Bulgaria (W) (Euro U16 B)
1
Ivayla Bakalova
U16 Bulgaria (W) (Euro U16 B)
1
Carlie Billing
U16 Sweden (W) (Euro U16 B)
1
Maria Brunner
U16 Austria (W) (Euro U16 B)
1
Jelena Bulajic 1
Hanna Cimmermann
U16 Austria (W) (Euro U16 B)
1
Lisen Curman
U16 Sweden (W) (Euro U16 B)
1
Inna Dimova
U16 Bulgaria (W) (Euro U16 B)
1
Silvana Dolmova
U16 Bulgaria (W) (Euro U16 B)
1
Janja Dragisic 1
Larisa Dzanko
U16 Austria (W) (Euro U16 B)
1
Dimitra Eftychiou
U16 Cyprus (W) (Euro U16 B)
1
Frida Esbjorn
U16 Denmark (W) (Euro U16 B)
1
Joyce Etute 1
Elena Georgieva
U16 Bulgaria (W) (Euro U16 B)
1
Sofia Gerges 1
Teodora Golemanska
U16 Bulgaria (W) (Euro U16 B)
1
Ava Hagerstrom
U16 Sweden (W) (Euro U16 B)
1
Paulina Hofer
U16 Austria (W) (Euro U16 B)
1
Ebba Jagre
U16 Sweden (W) (Euro U16 B)
1
Liv Jander 1
Lara Jemming 1
Ida Johansen
U16 Denmark (W) (Euro U16 B)
1
Anne Jorgensen
U16 Denmark (W) (Euro U16 B)
1
Ya Juwara
U16 Sweden (W) (Euro U16 B)
1
Shiloh Kalenga
U16 Sweden (W) (Euro U16 B)
1
Vanja Kaludjerovic 1
Klara Kampp
U16 Denmark (W) (Euro U16 B)
1
Anastasija Kasalica 1
Laura Kersch 1
Lisa Keup 1
Elrini Klouda
U16 Cyprus (W) (Euro U16 B)
1
Christina Koeppel
U16 Austria (W) (Euro U16 B)
1
Vanesa Kokalova
U16 Bulgaria (W) (Euro U16 B)
1
Alana Krings 1
Kalina Krupnikovic
U16 Sweden (W) (Euro U16 B)
1
Sophie Kunert
U16 Austria (W) (Euro U16 B)
1
Mia Lipscomb
U16 Denmark (W) (Euro U16 B)
1
Tereza Liska 1
Victoria Lundin
U16 Denmark (W) (Euro U16 B)
1
Eleni Lysandrou
U16 Cyprus (W) (Euro U16 B)
1
Mae Manti 1
Isabella Marion
U16 Denmark (W) (Euro U16 B)
1
Mollie Mauria
U16 Denmark (W) (Euro U16 B)
1
Lara Mayr
U16 Austria (W) (Euro U16 B)
1
Antriana Michaelide
U16 Cyprus (W) (Euro U16 B)
1
Despina Michail
U16 Cyprus (W) (Euro U16 B)
1
Silvia Milenova
U16 Bulgaria (W) (Euro U16 B)
1
Kathryn Missavage 1
Sofia Morfiti
U16 Cyprus (W) (Euro U16 B)
1
Sophia Nathanael
U16 Cyprus (W) (Euro U16 B)
1
Ksenija Nisavic 1
Lydia Papanicolaou
U16 Cyprus (W) (Euro U16 B)
1
Myriathi Petrou
U16 Cyprus (W) (Euro U16 B)
1
Masa Prascevic 1
Katarina Radulovic 1
Andela Rakocevic 1
Olivia Rebhahn-Roither
U16 Austria (W) (Euro U16 B)
1
Andela Rondovic 1
Andrea Rosenberg
U16 Denmark (W) (Euro U16 B)
1
Lena Schalbar 1
Anna Schmid
U16 Austria (W) (Euro U16 B)
1
Larissa Serban
U16 Austria (W) (Euro U16 B)
1
Marilia Siampoulli
U16 Cyprus (W) (Euro U16 B)
1
Anna Skog
U16 Sweden (W) (Euro U16 B)
1
Ivanina Slavova
U16 Bulgaria (W) (Euro U16 B)
1
Albena Sokolova
U16 Bulgaria (W) (Euro U16 B)
1
Nikoleta Stoynova
U16 Bulgaria (W) (Euro U16 B)
1
Ella Stromdahl
U16 Sweden (W) (Euro U16 B)
1
Penda Sutterluty-Fall
U16 Austria (W) (Euro U16 B)
1
Hanna Tjernberg
U16 Sweden (W) (Euro U16 B)
1
Adda Toney
U16 Denmark (W) (Euro U16 B)
1
Mariya Tsoneva
U16 Bulgaria (W) (Euro U16 B)
1
Valentina Vrcan 1
Ida Westphall
U16 Denmark (W) (Euro U16 B)
1
Dana Wies 1
Elvira Yao
U16 Sweden (W) (Euro U16 B)
1
Demetra Yennari
U16 Cyprus (W) (Euro U16 B)
1