| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:22.94 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Breaststroke | 1:21.50 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 100m Butterfly | 1:21.28 | 2025 Age Group International SC | 2025-11-27 |
| 100m Freestyle | 1:09.33 | 2025 MSSAC Harvest Invitational | 2025-11-01 |
| 1500m Freestyle | 4:09.68 | ESWIM Distance Time Trial | 2025-11-11 |
| 200m Breaststroke | 2:55.27 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m Freestyle | 2:31.05 | 2025 Age Group International SC | 2025-11-27 |
| 200m IM | 2:48.42 | Hall of Fame | 2025-10-18 |
| 400m Freestyle | 5:11.48 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 400m IM | 5:59.79 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Breaststroke | 38.30 | 2025 Age Group International SC | 2025-11-27 |
| 50m Butterfly | 35.05 | 2025 Age Group International SC | 2025-11-27 |
| 50m Freestyle | 31.50 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 800m Freestyle | 10:52.20 | 2025 Murray Drudge Invitational | 2025-12-05 |
Yiannacouras, Jason's top personal bests include 100m Backstroke (1:22.94), 100m Breaststroke (1:21.50), 100m Butterfly (1:21.28), 100m Freestyle (1:09.33), 1500m Freestyle (4:09.68).
Yiannacouras, Jason swims for Etobicoke Swim Club.
Yiannacouras, Jason has competed in 12 meets.