He had his first professional fight in October 1981, defeating Andrew DaCosta on points over six rounds, in Bloomsbury, London.

In his thirteenth fight he won the vacant Southern Area Light-Welterweight Title, defeating Vernon Vanriel on points over ten rounds, at York Hall in Bethnal Green.

In September 1984, he defeated Clinton McKenzie to take the British Light-Welterweight Title.
The fight was at the Britannia Leisure Centre, Shoreditch, and Marsh won on points over twelve rounds.

In October 1985, he fought the Italian, Alessandro Scapecchi for the vacant European Light-Welterweight Title.
The bout was held in Monte Carlo and Marsh won by a knock out in the seventh round.

He successfully defended his European title against Tusikoleta Nkalankete (French) in January 1986, and Francesco Prezioso (Italy) in April 1986.

On 4 March 1987, he fought the American, Joe Manley for the International Boxing Federation (IBF) World Light-Welterweight title.
The fight was at his home town of Basildon, and Marsh won on a technical knockout in the tenth round.

On 1 July 1987, he defended his IBF title against Japanese fighter, Akio Kameda at the Royal Albert Hall, Kensington.
Insisting it would be his last fight Marsh won, by a technical knockout in the seventh round.

He then retired as undefeated IBF world champion.
In September 1987 he announced that he had epilepsy.

He took up chessboxing at the age 56 winning the World Chessboxing association welterweight title against Dymer Agasaryan from Armenia.
He had his first professional fight in October 1981, defeating Andrew DaCosta on points over six rounds, in Bloomsbury, London.
In his thirteenth fight he won the vacant Southern Area Light-Welterweight Title, defeating Vernon Vanriel on points over ten rounds, at York Hall in Bethnal Green.
In September 1984, he defeated Clinton McKenzie to take the British Light-Welterweight Title. The fight was at the Britannia Leisure Centre, Shoreditch, and Marsh won on points over twelve rounds.
In October 1985, he fought the Italian, Alessandro Scapecchi for the vacant European Light-Welterweight Title. The bout was held in Monte Carlo and Marsh won by a knock out in the seventh round.
He successfully defended his European title against Tusikoleta Nkalankete (French) in January 1986, and Francesco Prezioso (Italy) in April 1986.
On 4 March 1987, he fought the American, Joe Manley for the International Boxing Federation (IBF) World Light-Welterweight title. The fight was at his home town of Basildon, and Marsh won on a technical knockout in the tenth round.
On 1 July 1987, he defended his IBF title against Japanese fighter, Akio Kameda at the Royal Albert Hall, Kensington. Insisting it would be his last fight Marsh won, by a technical knockout in the seventh round.
He then retired as undefeated IBF world champion. In September 1987 he announced that he had epilepsy.
He took up chessboxing at the age 56 winning the World Chessboxing association welterweight title against Dymer Agasaryan from Armenia.
Terry Marsh (boxer)