From 1995 to 1998, Oliver competed as a professional. When he defeated Bulgaria's Martin Krastev in May 1997 he became the
European (EBU) super bantamweight champion. He held onto the title for a year, defending it on three occasions with wins over Serge Poilblan, Vincenzo Belcastro and
Fabrice Benichou.
Injury In May 1998 he sought to defend his title again with a bout against Sergey Devakov at
Royal Albert Hall in London, which ended with Oliver suffering life-threatening injuries. Two minutes into the 10th round, Oliver was felled by a right hook and was counted out, the first loss of his career. It then became apparent that Spencer was seriously injured, a blood clot had formed in his brain, caused by a blood vessel that had been torn from a blow he received earlier in the fight. Spencer's
cutman, Eddie Carter, is credited for saving his life, by instructing the paramedics to sedate the boxer in order to minimise the damage. For 15 minutes he was treated in the ring by paramedics and supplied with oxygen, before being taken unconscious to Charing Cross Hospital. He was later transferred to a specialist neurology hospital and underwent a successful operation to remove the blood clot. ==Later life==