|Royal London One-Day Cup, 1st Central County Ground|
|Surrey 274-9 (50 overs): Foakes 64, Jacks 56; Hamza 4-43|
|Sussex 278-8 (48.1 overs): Wiese 92*, Wright 69; T Curran 3-37, Batty 2-39|
|Sussex (2 pts) won by two wickets|
Sussex got their One-Day Cup campaign off to a winning start at Hove as they kept their nerve to beat Surrey by two wickets with 11 balls to spare.
Despite having 10 internationals in their side, Surrey, hammered by Gloucestershire on Wednesday, have now lost both their first two group games.
Ben Foakes and Will Jacks both made half-centuries as Surrey posted 274-9.
Although they lost their eighth wicket with 20 still needed, David Wiese made 92 not out in their total of 278-8.
Following up opener Luke Wright's earlier 69, the South African all-rounder hit 14 fours as he registered his highest score for Sussex in 50-over cricket, despite an excellent 3-37 from one of Surrey's England men Tom Curran.
Earlier, Pakistan international left-armer Mir Hamza was the most successful Sussex bowler with 4-43, crucially tying Surrey up at the end of their innings in his final five overs.
Sussex now go to Kent on Sunday, but without seamer Ollie Robinson, who will be out "for a number of weeks" with a sore shoulder and may miss the rest of the competition.
Surrey do not play again until Tuesday when they host Essex at The Oval.
Sussex captain Ben Brown:
"It was good to see a big crowd and the sun out. It was a good time to watch cricket. The pitch was a bit sloppy and slow.
"We fielded brilliantly. And it was an extraordinary innings by David Wiese, one of the best one-day knocks we've had in the team for a while.
"Phil Salt got us off to a flyer against the new ball and Luke Wright batted really well. But the day belonged to David."
Man of the match David Wiese:
"It was nice to get off to a good start in this competition. It was a tough wicket. And you had to spend time at the wicket to get used to the pace.
"Tom Curran was the pick of their bowlers so we gave him the respect he deserved and got over the line."
Surrey captain Rory Burns:
"It was disappointing. We were slightly under par with our total.
"But Tom Curran bowled really well at the end to keep it tight."