Petery Moylan made it to the bigs after pitching in the World Baseball Classic in 2006. Perhaps it was to his advantage that the Australian team was playing in Cracker Jack Stadium where the Atlanta Braves (who signed him) had a chance to see him outside of game action. He showed some nasty stuff in the WBC, but also showed control issues.
He turned that one WBC appearance against team Venezuela on March 9, 2006 in front of 10,111 into a pretty good major league career. In that one memorable appearance - he threw 51 pitches in 1.2 innings, struck out 4 and walked 5 - yielding 1 run. Australia lost the game 2-0
He was not on the Australian roster for the 2009 tournament.
Atlanta signed him and he pitched a good part of 2006 at AAA, making his MLB debut later that year, appearing in 15 games.
While he's currently on the DL and will be having back surgery next week to repair a bulging disc, he's done pretty well for himself. 2011 is his 6th season in he bigs and he has appeared in 281 games, all out of the pen. He's appeared in 80 or more games 3 times (80, 87 and 85 in 2007, 2009 & 2010 respectively). He's struck out 201 in 251 career innings. His career WHIP is 1.29. He has a record of 18-8 with an ERA of 2.61 with 3 saves. He's also lowered his walk total since that WBC game - allowing 111 runners to reach base on balls.