The Hague, The Netherlands, July 2, 2015 - In a contest of unbeatens in the 2015 FIVB “senior” Beach Volleyball World Championships, eighth-seeded Jonathan Erdmann/Kay Matysik of Germany meets ninth-seeded Tri Bourne/John Hyden of the United States here Thursday afternoon with both teams playing their fifth-straight match on the sand at The Hofvijver stadium court.