| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 2:03.62 | GRAC 2026 Green-Black-Blue Meet #2 | 2026-03-14 |
| 100m Breaststroke | 3:08.20 | 2025 Alan Swanston Classic | 2025-12-05 |
| 100m Freestyle | 1:59.39 | GRAC 2026 Green-Black-Blue Meet #2 | 2026-03-14 |
| 200m Backstroke | 4:05.27 | GRAC 2026 Green-Black-Blue Meet #2 | 2026-03-14 |
| 200m Freestyle | 4:36.66 | GRAC 2026 Green-Black-Blue Meet #2 | 2026-03-14 |
| 25m Backstroke | 29.28 | MAC Jingle Bell | 2025-12-12 |
| 25m Breaststroke | 40.29 | MAC Jingle Bell | 2025-12-12 |
| 50m Backstroke | 1:00.74 | GRAC 2026 Green-Black-Blue Meet #2 | 2026-03-14 |
| 50m Breaststroke | 1:08.83 | GRAC 2026 Green-Black-Blue Meet #2 | 2026-03-14 |
| 50m Freestyle | 57.60 | MAC Jingle Bell | 2025-12-12 |
Guan, Mark's top personal bests include 100m Backstroke (2:03.62), 100m Breaststroke (3:08.20), 100m Freestyle (1:59.39), 200m Backstroke (4:05.27), 200m Freestyle (4:36.66).
Guan, Mark swims for Blue Shark Swim Club.
Guan, Mark has competed in 4 meets.