|Royal London One-Day Cup, Kia Oval|
|Gloucestershire 282-6 (50 overs): Higgins 81*, Howell 60, J Taylor 54|
|Surrey 286-4 (45.4 overs): Jacks 121, Elgar 50, Foakes 50*|
|Surrey won by six wickets|
Surrey teenager Will Jacks made a stunning maiden century at The Oval to help his side beat Gloucestershire by six wickets in the One-Day Cup.
From 131-5, Ryan Higgins' unbeaten 81, after a stand of 110 with Jack Taylor (54), helped Gloucestershire to 282-6, Benny Howell having earlier made 60.
But 19-year-old Jacks then took over, hitting four sixes and 14 fours in his 121 off 100 balls in Surrey's 286-4.
Ben Foakes and Dean Elgar hit fifties as Surrey won with 26 balls to spare.
Foakes was unbeaten at the end on 50 not out, from 52 balls, while Elgar also made a round 50 as Surrey, runners-up in both 2016 and 2017, finally got this season's cup campaign off and running.
Opening batsman Jacks, who is yet to make his first-class debut, was playing only his third game - and had earlier contributed five tight overs of spin.
Gloucestershire, who had won their first two matches, will bid to bounce back from their first defeat, at home to Hampshire in Friday's day-night match.
Surrey play their next game at Chelmsford on Sunday against Essex.