Lewis Rees has won three Welsh ABA and two Home Nations titles
Lewis Rees will make his professional debut on the undercard of Nathan Cleverly's world WBO light-heavyweight title shot against Juergen Braehmer.
The Welsh light-welterweight will compete in a four-round floater against a yet unnamed opponent at The O2 Arena in London on Saturday, 21 May.
Rees said: "It's a massive opportunity for me to make my debut at The O2 on the same night as a world title fight."
The rookie turned professional with coach Gary Lockett in January.
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