Disgraced tennis star Boris Becker is struggling to adjust to life behind bars as he comes to grips with the 'constant noise' and small portions of basic food.

The 54-year-old champion, known for enjoying luxuries like Cuban cigars, fine wines and fillet steak, was brought back down to earth after being served corned beef on his first night in prison.

He was jailed for two and a half years last week for hiding assets during bankruptcy proceedings.