Clayton Graham Blackmore  is a former Welsh international footballer. He was a combative player known for his attacking free kicks who excelled at full back and in central defence but could play equally well in midfield or as an emergency forward.Blackmore once had trials with Neath Rugby Club but, instead joined Manchester United as an apprentice. Having come through the United youth system he won the first of his 39 caps for Wales after only two first team appearances at Old Trafford. He has the unique distinction of having worn every number for United from 2 to 11 (under the old system of the first XI wearing shirts numbered 1-11, until players were assigned with a squad number to keep all season).