Although Erasmus was born in South Africa, he grew up in Brisbane, Australia where he started his baseball career and has represented both countries.
[1] He was named to the South Africa national baseball team for the 2009 World Baseball Classic where he started against Mexico, giving up an RBI double and two-run home-run to Adrián González, finishing the tournament 0-1 with a 9.00 ERA.
In 6 games, including 3 starts he conceded a 6.38 ERA over 18.1 innings in the hitter-friendly Australian Baseball League.
[3] In 2011 Erasmus was promoted to the Greenville Drive in Low-A where he pitched an even more outstanding 1.11 ERA over 40.2 innings.
Erasmus's brother Bradley represented South Africa as a catcher in the 2006 World Baseball Classic.