Luol Deng hit 24 points to lead all scorers on his home debut as Great Britain destroyed Ireland 88-59 in a friendly at the K2 Arena in Crawley.
Deng made his senior debut for the national team last week in France
GB led from gun to tape, taking the first quarter 27-8 as NBA star Deng hit nine points and Richard Midgley five.
In the third quarter, the lead stretched to 39 points as Ireland failed to score for eight minutes.
Midgley finished with 12 points and Andrew Sullivan had 11. Conor Grace led Ireland's scorers with 18 points.
"Luol gives us versatility, profile and class," said GB coach Chris Finch.
"He's very receptive - he asked a lot of questions about the differences in the international game. We're trying to help educate him."
Ireland were able to close the final score to within 30 points when GB took their foot off the gas in the final quarter.
Although Chicago Bulls man Deng was the star of the show, looking the most complete player in action, the game also gave Scottish centre Robert Archibald his first on-court action.
He hit six points after coming on in the second half, his first game since recovering from an ankle injury.
The teams square up again on Friday night, when Britain play their last warm-up match before their first European qualifying tie against Slovakia in Birmingham on Tuesday.