BIRMINGHAM (Reuters) - Samoa’s Rugby World Cup campaign is hanging in the balance after defeat by South Africa and with two more tough challenges to come in the form of Japan and Scotland, coach Stephen Betham said after Saturday's 46-6 defeat against South Africa. With the top two in Pool B advancing to the quarter-finals, Samoa face crunch games against Japan and Scotland as they chase a place in the last eight of the tournament for only the third time. “All the games are hard but the Ja