Merciless" Ray Mercer is an American professional boxer, former Olympic 1988 Seoul Olympic Gold Medalist and WBO heavyweight title holder. He has also competed in kickboxing and mixed martial arts. Ray Mercer has hand signed these black satin boxing trunks. Leaf Hologram and Certificate of Authenticity. If a product is unsigned or non game-used, a hologram will not be included Ray Mercer memorabilia. Tampa Bay Rays memorabilia