Competing on the international stage will be nothing new for Ruback.
Last August, he represented New Zealand at the Pan Pacific junior open water championships in Honolulu, Hawaii, coming seventh in the 10km event in a time of 1h 46min 23s - just over four minutes behind the eventual winner, American David Heron.
Ruback made the Pan Pacific team after a gutsy victory in the 16-17ys age group at the national open water championships in Taupo last January. The win came about despite his preparation being hampered by a broken arm from snowboarding.
After surgery, Ruback had to adjust his training schedule, only getting back to full training in mid-December.