Prazak made her professional boxing debut on 13 March 2010 in Moonee Valley, Victoria, Australia. She was defeated via unanimous decision after six rounds with fellow Australian Sarah Howett. In 2012, she moved to Los Angeles and began training under
Lucia Rijker. In 2013, she fought against Super Featherweight Champion
Frida Wallberg, who was defeated by her in Sweden with a knock out in the 8th round. Prazak won the title, Wallberg was hospitalized and received emergency surgery to relieve the pressure on her brain from a
cerebral haemorrhage. This fight, and the road leading to it, is captured in the documentary
Bittersweet, showing Dutch former professional boxer
Lucia Rijker training Diane to prepare her for the fight. When Prazak retired from boxing, she had won 14 professional fights and lost 4. In 2025, Prazak was inducted into the
International Women's Boxing Hall of Fame. ==Championships and accomplishments==