Four Indians assured themselves of a bronze medal each after reaching semifinals in their respective categories in the 3rd China Open boxing tournament at Guiyang today.Sunil Kumar in 52kg , Ajay Kumar in 56kg, Jaideep in 75kg and Manjeet Singh in 91 kg plus categories made it to the last four of the tournament played under the new 'Ten-Point must scoring system'.But the Indian contingent suffered early setbacks in the women's division. Pinki Jangra in 51kg, Preeti Beniwal in 60kg and Neetu Chahal in 75kg categories all failed to make it past the quarterfinals.