<page_title> Shaunae Miller-Uibo </page_title> <section_title> International competitions </section_title> <table> <cell> 2010 <col_header> Year </col_header> </cell> <cell> World Junior Championships <col_header> Year </col_header> </cell> <cell> 1st <col_header> Venue </col_header> </cell> <cell> 400 m <col_header> Position </col_header> </cell> </table>
Miller-Uibo became the 400 m champion at the 2010 World Junior Championship.