Sussex captain Luke Wright led by example at Sophia Gardens as his team gained their second win from two Vitality Blast games with victory over Glamorgan.
Wright's 88 from 53 balls was the highlight of an impressive team performance in an eight-wicket victory which takes them to the top of the South Group.
After scoring 173 for four, with Colin Ingram top-scoring with an undefeated 81, the hosts were let down by some poor bowling as Wright and Laurie Evans shared a match-winning partnership of 123 in 12.4 overs.
Needing to score at 8.6 runs an over, Wright began with a flurry of boundaries although he lost his opening partner Phil Salt in the fourth over, who, attempting to pull a short ball from Michael Hogan, edged to the wicketkeeper.
Wright then drove Graham Wagg straight for six, followed by a rasping cover drive for four, and when Wagg was taken off after one over, he had conceded 16 runs.
The Sussex captain raced to his half-century from only 33 balls and his team were well placed at the halfway stage on 89 for one.
Wright was well supported by Evans, who also punished some indifferent bowling from Glamorgan, who bowled far too short on a good pitch.
Sussex were coasting at 109 for one at the end of the 12th over and the hosts predicament worsened when their Australian batsman Shaun Marsh dived in an attempt to stop a fierce drive from Wright but landed on his shoulder, and had to leave the field in pain.
Sussex required 41 from the final five overs, but there was no respite for the bowlers as Wright drove Ingram and hooked Wagg for sixes, before holing out on the midwicket boundary.
Evans settled the issue by striking Hogan for two sixes in the 18th over, and there were eight balls remaining when Tom Bruce struck the winning runs.
Glamorgan's innings was built around a typically aggressive innings from Ingram. He was well supported by David Lloyd, who made 33 - including a straight six off Rashid Khan, who again bowled economically and picked up two wickets.
Glamorgan were 59 for three after nine overs, after Marsh had pulled a long hop from Joffra Archer to deep midwicket, before Usman Khawaja mishit to deep cover and Aneurin Donald holed out to Khan at long-off.
Ingram was then soon into his stride, and played Khan - who was in the same Adelaide Strikers side that won the Big Bash Australia last winter- with respect. The Afghanistan spinner ended with the creditable figures of two for 27 from his four overs.
Ingram accelerated in the final overs, Ollie Robinson and David Wiese were struck for two huge sixes over long-on as 53 runs were added in the final five overs.
Ingram's undefeated 81 came from 44 balls and contained four sixes and seven fours.