Smith stroked 96 and was one of three batsmen getting half-centuries in the match at the Stanford Cricket Ground, which will bring the curtain down on the week-long preparation camp for the Australia series.
The 26-year-old stroked ten fours and three sixes and faced 221 balls. He shared a third-wicket stand of 169 with Ryan Hinds who scored 66 with six fours off 190 balls.
Wicketkeeper/batsman Denesh Ramdin chipped in with an unbeaten 50 off 86 balls, which was decorated with five fours and one six.
Antigua & Barbuda start their reply today. (CMC)