Montserrat won the toss and batted first, making 121 All Out, off 49.5 overs, with Jason Peters top scoring with 42 and Deno Baker making 18.
Captain Jacques Taylor was the pick of the Kittitian bowlers picking up 7 wickets for 43 runs with Darren Hobson contributing 2 wickets for 10 runs.
St. Kitts in reply were 135 for 3 off 48.3 overs when bad light stopped play with 20 minutes remaining in the day’s play on Saturday.
Seventeen year old Darren Hobson has top scored so far in St. Kitts’ innings with 56 runs to his name and his opening partner Welton Edwards 44.
The match is continuing on Sunday, the second day.
Meanwhile in the other match of the weekend, Anguilla vs Antigua & Barbuda, Antigua & Barbuda batting first, scored 352 all out from 85.3 overs.
Captain Sylvester Joseph made 108, from 174 balls, in 202 minutes. Maxwell Georgeson 65, Austin Richards jr 63, Mali Richards 47 and Justin Athanaze 34.
Bowling for Anguilla – Yanick Leonard 6/90, Shane Burton 2/51, Chake Hodge 2/103.
Anguilla cloesd Day One on 74/4 from 32 overs; Lyndell Richardson 20
Bowling for Antigua & Barbuda – Anthony Martin had 2/16.