DEFENDING champions Jamaica won the toss and opted to take first strike on the opening day of the semi-final match of the regional four-day tournament against Guyana at Sabina Park.
After 12 overs Jamaica are 38-1.
Brenton Parchment is on 19, while his partner Donovan Pagon is on six.
Opener Xavier Marshall was bowled off an under-edge for nine by seamer Ransford Beaton.
Ja XI- Tamar Lambert (capt), Brenton Parchment, Xavier Marshall, Donovan Pagon, Jermaine Blackwood, David Bernard, Horace Miller, Nikita Miller, Andrew Richardson, Odean Brown, Sheldon Cotterell.
Guyana XI- Shivnarine Chanderpaul, Leon Johnson, Trevon Griffiths, Assad Fudadin, Narsingh Deonarine, Chanderpaul Hemraj, Derwin Christian, Devendra Bishoo, Ransford Beaton, Veerasammy Permaul, Brandon Bess.