Gloucestershire 288 for 5 (Dent 151*) beat Glamorgan 281 for 6 (Wallace 118*, Wagg 54) by 7 runs
Chris Dent scored a maiden one-day century to help Gloucestershire to an exciting seven-run victory over Glamorgan in a high-scoring Group C clash.
Dent's 151 not out led Gloucestershire to 288 for 5 from their 40 overs at the SWALEC Stadium, before Mark Wallace (118 not out) and Graham Wagg (54) saw Glamorgan fall just short.
On an easy-paced pitch Dent was able to help Gloucestershire punish Glamorgan's attack after being put into bat by Marcus North. The visitors lost Hamish Marshall early on but they were nevertheless not hanging about with Dean Cosker's first two overs conceded 19 runs.
Gloucestershire lost captain Michael Klinger for 40 from 47 balls, caught off a leading edge at cover, but the 100 came up in only the 16th over with Dent bringing up his 50 off 39 balls. Former England paceman Simon Jones, playing his first game of the season, did peg Gloucestershire back briefly by bowling a maiden to Dent, whose previous List A best was just 36.
Gloucestershire reached the halfway stage in a good position at 120 for 2 but they lost Alex Gidman to Will Bragg, who claimed his first wicket in one-day cricket. Dent, though, continued his assault on the Glamorgan bowlers and brought up his century off 89 balls, including 10 fours and two sixes.
In the final 10 overs Gloucestershire racked up 110 runs, with Dent remaining instrumental as he put on 73 with James Fuller in just 24 balls.
Glamorgan made a disastrous start to their run-chase with Bragg out for a duck, trapped lbw to James Fuller's second ball, and then having Chris Cooke removed by the same bowler for 15. Glamorgan's hopes looked dashed when North was run out for 5 with a direct hit from Benny Howell, leaving the hosts on 27 for 3.
But Wallace and Jim Allenby launched a recovery, with a slog sweep for six by the latter bringing up the Glamorgan 100 in the 17th over. Wallace shared in partnerships of 95 with Allenby in 12.3 overs and then 67 with Murray Goodwin. But it was the Wallace-Wagg alliance that so nearly brought Glamorgan victory.
The pair put on 82 in 8.4 overs to bring the prospect of victory ever closer. Glamorgan had needed 100 off the final 10 overs, but that was brought down to 60 off six overs and then 31 off three overs as Wallace reached 100 off 98 balls and Wagg struck three big sixes.
But with 18 needed off eight balls, the pressure mounted on Glamorgan and Wagg holed out to Marshall at long-on off Fuller. And the 17 required from the final over proved too much for Wallace and Will Owen as Gloucestershire held on for the win.