Carifta gold medallist Attoya Harvey of Guyana
Harvey was timed at four minutes, 45.75 seconds, winning ahead of Kayleigh Forde (4:52.14s) of Trinidad and Tobago and Kededra Coombs (4:52.19s) of the host nation.
McPherson clocked 55.39 seconds, finishing behind Abigail Campbell (53.83s) and ahead of Quana Walker (55.65s), both of Jamaica.
Roberts (4:12.5s) finished behind Keeran Sriskandarajah (4:10.58s) of Trinidad and Tobago and ahead of Jamaican Yoshane Bowen (4:13.15s) of Jamaica.
Action in the regional showpiece, which brings together the very best Under-17 and Under-20 athletes from across the Caribbean, will continue on Sunday. The event concludes on Monday.
