Grusander made her professional debut against Iman Darabi at FNF 10.[2] She won the fight by majority decision.[3]
Grusander was scheduled to fight Anna Kuzmenko at Battle of Botnia 2016. She won the fight by a third-round technical knockout.[4]
Grusander was scheduled to fight the former K-1 Krush Flyweight and future Pancrase champion Syuri Kondo at Pancrase 284. Kondo won the fight by unanimous decision.[5]
Returning to Finland, Grusander was scheduled to fight Tiia Kohtamaki at FNF 14.[6] Grusander won the fight by a third-round technical knockout.[7]
Grusnader was scheduled to fight Elena Belaya at FNF 15. She won the fight by a first-round rear-naked choke submission.[8]
Grusander was scheduled to fight outside of Finaland for the second time in her professional career, being scheduled to fight Hanna Gujwan at Ladies Fight Night 8.[9] She won the fight by a second-round rear-naked choke.[10]
Invicta
Grusander was scheduled to make her Invicta debut against Fernanda Barros at Invicta FC 28: Mizuki vs. Jandiroba. The fight was likewise Grusander's atomweight debut.[11] Grusander won the fight by a second-round TKO.[12]
In her second fight with Invicta, Grusander was scheduled to challenge the reigning Invicta FC Atomweight championJinh Yu Frey at Invicta FC 30: Frey vs. Grusander.[13] Frey won the fight by a highly controversial unanimous decision (49-46, 48-47, 48-47).[14] The majority of fans scored the fight for Grusander.[15] MMA Viking awarded the fight the 2018 "Robbery of the Year".[16]
An immediate rematch with Jinh Yu Frey was scheduled for Invicta FC 33: Frey vs. Grusander II.[17] Frey won the closely contested fight by split decision, with scores of 48-47, 47-48 and 48-47.[18] The media members scored the fight for Frey.[19]
Post title fights
After losing back-to-back title fights, Grusander returned to strawweight and was scheduled to fight Magdaléna Šormová at Oktagon 16. Šormová won the fight by unanimous decision.[20]