The Clonmel Boxing club member was up against Mahammad-rausl Majidor of Azerbaijan in the 91 kilo weight division.
Gardiner was beaten by a unanimous decision in his opening fight in the men's Super Heavyweight division.
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There's a further three Irish boxers in action today
In the afternoon session, David Oliver Joyce will face a Georgian opponent in their last-16 contest while Michael O'Reilly will go up against a Finnish fighter in his first outing in the middleweight division.
During the evening session heavyweight Darren O'Neill will face Gabriel Richards of Sweden in their last-16 bout.
