Jacques Rudolph produced a stunning innings to condemn Sussex to defeat in their final match in the Royal London One Day Cup at Hove.
Rudolph scored an unbeaten 169 as Glamorgan chased down a target of 329 to win from 48 overs with eight balls and seven wickets to spare.
The South African’s third century in the competition this season was also the highest in List A cricket for Glamorgan, surpassing the great Viv Richards who made an unbeaten 162 in 1993.
His innings also overshadowed another brilliant century from Luke Wright and a blistering unbeaten 92 from Harry Finch which enabled Sussex to score 323-3.
Wright had carried on from his century in the Championship match against Yorkshire with another superb knock.
He dominated a stand of 71 for the first wicket with Chris Nash which was ended when Nash was trapped lbw by Dean Cosker for 24.
Wright brought up his 50 from 43 balls and moved to his 100 from a further 62 deliveries, including 11 fours and two sixes.
He got good support from Craig Cachopa who hit 45 from 57 balls but the Sharks innings really took off when Finch joined him at the crease.
The pair put on 79 from just 54 balls and an even bigger total looked on the cards until Wright skied a catch to the wicketkeeper trying to smash Michael Hogan for a third six and his fifth of the game.
The departure of Wright only prompted Finch to go on the attack more as he raced to his 50 off just 37 balls with five fours and two sixes.
Together with Matt Machan they put on 74 from 43 balls and it was only a shame Finch ran out of time to reach what would have been a remarkable century.
Glamorgan needed someone to go big if they were to stand a chance of chasing down a revised total of 329 to win and it was no surprise it was Rudolph who took on the responsibility.
The South African has been in sensational form in the competition this season and together with Gareth Rees they began making inroads into the Sussex total.
Rudolph reached his 50 off 53 balls and needed only another 40 deliveries to bring up his third century in the competition this year.
Rees offered good support with a run-a-ball 50 and was unfortunate to be run out for 60 when he was sent back by Rudolph trying to steal a single to Ed Joyce.
The brought Murray Goodwin to the crease and the former Sussex batsman rolled back the years on what could be his final appearance at Hove.
Goodwin smashed 59 off just 26 balls in a partnership of 100 with Rudolph before being leaving the pitch to a warm round of applause after being trapped lbw by Yasir Arafat.
Rudolph extinguished any glimmer of hope Sussex may have had as he eased Glamorgan over the line with eight balls to spare.