Hammer was born in what is now Kazakhstan and grew up in Germany. She began kickboxing before moving into amateur boxing, then entered the professional ranks as a teenager; the WBO’s coverage identifies her long association with its middleweight championship, while WBC coverage records her standing in the division.

She won her first world title in 2010 at age 20 and developed a technically controlled, long-range style. Her professional record and bout history are listed by BoxRec, the standard independent boxing record database. By the end of her original unbeaten run she had accumulated title defences in Germany and elsewhere, giving her recurring television and event income rather than a single championship payday.

The WBO middleweight title turned Hammer into one of Germany’s leading female fighters. She defended it repeatedly and later added a super-middleweight belt, building a championship résumé over many years rather than around one isolated event.

Hammer unified middleweight belts and eventually faced Claressa Shields for the undisputed championship in Atlantic City in 2019. The result and historical significance of that bout are documented by ESPN. The contest was televised by Showtime and consolidated four middleweight belts, making it the clearest candidate for the largest purse of Hammer’s career, although neither fighter’s pay was officially disclosed.

Fight purses, win and championship payments, sponsorships, appearances and modelling formed the main income channels. German television exposure across repeated title defences likely made those bouts commercially more valuable than ordinary undercard appearances, but it does not disclose Hammer’s share. Because most purses were not publicly reported, it would be unreliable to multiply her number of bouts by modern headline paydays from a different era.

Hammer worked with sportswear and fitness brands, including an association reported by Anita. Such partnerships added income and visibility, although the contract values were private.

She also lent her name to an online-casino venture that pledged part of income to boxing charities. World Boxing News described the WBC Cares connection. Public reporting does not establish the venture’s profitability or Hammer’s eventual proceeds.

No reliable public register reveals a complete property, investment or debt position. Training camps, promoters, managers, travel and tax reduce gross boxing income, while the scale of sponsorship and modelling fees is unknown.