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| World Junior Championships, 10 - 15 July, 2018, Tampere, Finland | Representing |
| 10 July | Under-20 Men | 100 Metres | HEAT 3 | 1 | Chad Miller | (Hercules Wimbledon AC) | 10.33/+0.5 | Q | | Great Britain & Northern Ireland |
| 10 July | Under-20 Women | 800 Metres | HEAT 5 | 2 | Katy-Ann McDonald | (Blackheath & Bromley Harriers AC) | 2:07.24 | Q | | Great Britain & Northern Ireland |
| 11 July | Under-20 Men | 100 Metres | S-FINAL 3 | 3 | Chad Miller | (Hercules Wimbledon AC) | 10.38/+0.1 | | | Great Britain & Northern Ireland |
| 11 July | Under-20 Women | 100 Metres | HEAT 4 | 1 | Kristal Awuah | (Herne Hill Harriers) | 11.35/+1.8 | Q | | Great Britain & Northern Ireland |
| 11 July | Under-20 Women | 800 Metres | S-FINAL 2 | 2 | Katy-Ann McDonald | (Blackheath & Bromley Harriers AC) | 2:03.20 | Q | | Great Britain & Northern Ireland |
| 12 July | Under-20 Women | 100 Metres | S-FINAL 3 | 1 | Kristal Awuah | (Herne Hill Harriers) | 11.37/+0.3 | Q | | Great Britain & Northern Ireland |
| 12 July | Under-20 Women | 100 Metres | FINAL | 3 | Kristal Awuah | (Herne Hill Harriers) | 11.37/0.0 | | | Great Britain & Northern Ireland |
| 12 July | Under-20 Women | 800 Metres | FINAL | 7 | Katy-Ann McDonald | (Blackheath & Bromley Harriers AC) | 2:04.08 | | | Great Britain & Northern Ireland |
| 13 July | Under-20 Men | 4 X 100 Metres Relay | HEAT 1 | - | Chad Miller (Leg 2) | (Hercules Wimbledon AC) | DNF | | | Great Britain & Northern Ireland |
| 13 July | Under-20 Women | 4 X 100 Metres Relay | HEAT 1 | 2 | Kristal Awuah (Leg 1) | (Herne Hill Harriers) | 44.84 | Q | | Great Britain & Northern Ireland |
| 14 July | Under-20 Women | 4 X 100 Metres Relay | FINAL | 3 | Kristal Awuah (Leg 1) | (Herne Hill Harriers) | 44.05 | | | Great Britain & Northern Ireland |
