Tymalk Mills’ side qualified for Vitality Blast Finals Day at Edgbaston by finishing second in the south group then thrashing Lancashire in the quarter-finals.
They are playing Gloucestershire in the second semi-final after Somerset beat Surrey by six wickets in the first semi.
Here are the best of the pictures from Sussex’s big day in Birmingham, taken by John Mallett. We'll have news and reaction from the semi-final here soon.
1. View of the pavilion before the Vitality T20 Finals Day semi-final 2024 match between Surrey County Cricket Club and Somerset County Cricket Club at Edgbaston, Birmingham, United Kingdom on 14 September 2024.
View of the pavilion before the Vitality T20 Finals Day semi-final 2024 match between Surrey County Cricket Club and Somerset County Cricket Club at Edgbaston, Birmingham, United Kingdom on 14 September 2024. : Sussex at Vitality Blast Finals Day 2024 Photo: John Mallett/ProSportsImages : John Mallett
2. James Coles before the Vitality T20 Finals Day 2024 semi-final match between Sussex County Cricket Club and Gloucestershire County Cricket Club at Edgbaston, Birmingham, United Kingdom on 14 September 2024.
James Coles before the Vitality T20 Finals Day 2024 semi-final match between Sussex County Cricket Club and Gloucestershire County Cricket Club at Edgbaston, Birmingham, United Kingdom on 14 September 2024. : Sussex at Vitality Blast Finals Day 2024 Photo: John Mallett/ProSportsImages : John Mallett
3. General view across the ground before the Vitality T20 Finals Day semi-final 2024 match between Surrey County Cricket Club and Somerset County Cricket Club at Edgbaston, Birmingham, United Kingdom on 14 September 2024.
General view across the ground before the Vitality T20 Finals Day semi-final 2024 match between Surrey County Cricket Club and Somerset County Cricket Club at Edgbaston, Birmingham, United Kingdom on 14 September 2024. : Sussex at Vitality Blast Finals Day 2024 Photo: John Mallett/ProSportsImages : John Mallett
4. The Vitality Blast Trophy before the start of the Vitality T20 Finals Day semi-final 2024 match between Surrey County Cricket Club and Somerset County Cricket Club at Edgbaston, Birmingham, United Kingdom on 14 September 2024.
The Vitality Blast Trophy before the start of the Vitality T20 Finals Day semi-final 2024 match between Surrey County Cricket Club and Somerset County Cricket Club at Edgbaston, Birmingham, United Kingdom on 14 September 2024. : Sussex at Vitality Blast Finals Day 2024 Photo: John Mallett/ProSportsImages : John Mallett