COLLEGIATE BESTS:
| Event | Score | Date | Site/Opponent |
| 200 IM | 1:47.60 | 2/29/24 | B1G Championship |
| 400 IM | 3:49.95 | 3/1/24 | B1G Championship |
| 100 Breast | 55.80 | 10/20/23 | Pitt/Notre Dame |
| 200 Breast | 2:02.45 | 123/23 | Big Al Invitational |
| 200 Fly | 1:46.16 | 3/2/24 | B1G Championship |
High School
Karahalis enjoyed a very successful career at Oxford high where he was awarded Ches-Mont Swimmer Of The Year during his senior campaign. Competing in the 100 fly, 200 IM and 100 breast during his high school career, Karahalis won several awards including YMCA National Champion, All-American and USA Swimming Scholastic All-American.
Personal
Karahalis has also swam for Delaware Swim Team and Western Branch YMCA. When not in the pool he enjoys Hiking and exploring the great outdoors. He is the son of Alex and Jessi Karahalis.