Mitchell now has 16 KOs from 22 pro bouts

Londonder Mitchell, 22, downed the South African with a raking right to take his record to 22-0.

Derry Matthews survived a first-round knockdown and two deducted points to retain his WBU featherweight title.

The home fighter won by decision against reigning British champion John Simpson 118-112 117-110 113-111.

Simpson was full of confidence after his opening knockdown, landing another great right in the third and a right to the ribs which had Matthews clinging on.

A cut on the left side of Simpson's head in round six prompted the Scot to increase the pace before referee Micky Vann docked Matthews a point for holding.

I am the best featherweight in Britain and I know next time I will be back better than ever Derry Matthews

He was deducted a second point in the ninth for hitting in a clinch, taking him to the brink of disqualification.

But with Simpson tiring badly towards the end, Matthews summounded enough strength to take a narrow verdict.

Matthew said: "He caught me round the chin but I am the fittest I have ever been and I am the best featherweight in Britain.

"I know next time I will be back better than ever."

Meanwhile, Mitchell went one better than his friend, top featherweight Nicky Cook, who was extended to eight rounds by Ramogoadi in December.

He said: "I knew he didn't like being put under pressure so that is what I went out to do."

Ramogoadi, who has fought the majority of his career at featherweight, was in survival mode from the start.

But the champion stayed patient and stung his opponent with a fine right hand to the ribs in the fourth round before gradually cranking up the pressure.

Souleymane M'Baye retained his WBA light-welterweight title after a controversial draw against Ukraine's Andreas Kotelnik in Liverpool.

The 31-year-old Frenchman got a 115-114 verdict from judge Paul Thomas, Mickey Vann favoured Kotelnik 117-112, while Terry O'Connor scored a 114-114 draw.

Kotelnik, 29, had previously lost to M'Baye on split decision in their first meeting in October 2004.

M'Baye boxed well on the counter-attack but faded in the later rounds.

Kotelnik, coming off three straight wins since losing to current WBC champion Junior Witter in 2005, believed he had done enough after finishing with a strong last round.