 Complete the following phrase:  Sultan-Ahmed Magomedsalihovich Ibragimov ; born 8 March 1975 is a retired Russian professional boxer of Dagestani descent who competed from 2002 to 2008, and held the WBO world heavyweight title from 2007 to 2008. He was ranked by BoxRec as the worlds No.7 heavyweight in 2005 and 2006 and as No.6 heavyweight in 2007 and 2008. As an amateur he won silver medals at the 2000 Olympics and 2000 European Championships, and bronze at the 