Rubuta ci gaba ga wannan sakin layi - A 2014
, Mantha ya wakilci ƙungiyar Kanada a gasar IIHF ta Duniya ta Junior Ice Hockey. Mantha shi ne babban mai zira kwallaye a Kanada, inda ya zira kwallaye biyar da mataimakansa shida a wasanni bakwai, kuma an kira shi zuwa 2014 WJC All-Star Team.