Five-time boxing champion M C Mary Kom, will take on Sweden's Juliana Soderstrom in her opening bout of the highly competitive World Women's Boxing Championship at Astana, Kazakhstan tomorrow. Mary Kom will be competing in the 51 kg category. The event — the final qualifying tournament for women boxers in the three Olympic categories of 51kg, 60kg, and 75kg — has 12 Rio tickets on offer which means pugilists will have to at least make to the semifinals of the three chosen divisions to book their berth. The other Indians, who would be eyeing Olympic slots apart from Mary Kom are L Sarita Devi (60kg) and Pooja Rani (75kg).Mary Kom, a London Olympics bronze-medallist and Asian Games gold-medallist who is eyeing a record sixth gold in the event, will be in action tomorrow along with and Asiad bronze-winner Sarita. Sarita will be up against Belarus' Ala Yarshevich and if she wins the contest, the Manipuri will square off against Mexico's Victoria Torres. Pooja, on the other hand, got a first-round bye and will be squaring off against Ukraine's Mariya Borusta on May 20th.