COLLEGIATE BESTS:
| Event | Score | Date | Site/Opponent |
| 100 Breast | 55.10 | 12/2/23 | Big Al Invitational |
| 200 Breast | 1:59.24 | 12/3/23 | Big Al Invitational |
| 200 IM | 1:46.10 | 12/1/23 | Big Al Invitational |
| 400 IM | 3:48.98 | 3/1/24 | B1G Championship |
High School
During Slavica's high school career at Ekonomaska, he was a Croatian national record holder.
Personal
Slavica is the son of Marijo and Ivana and has a younger brother David. Before attending high school, Slavica swam for his hometown club of PK Sibenik.
Why I Chose Penn State
"I chose Penn State because of the amazing opportunities offered coupled with the exceptional history and culture that Penn State has."