Arul Suppiah also weighed in with useful left-arm spin, conceding 27 from four overs.

BBC: Somerset claim maiden Cup victory

Trescothick led the charge with 142, sharing century partnerships with Arul Suppiah (47) and Justin Langer (89no).

BBC: Trescothick leads Somerset charge

And he was followed by fellow opener Arul Suppiah, who fell to the left-arm spin of Rangana Herath.

BBC: Sean Ervine puts Hampshire in control against Somerset