Everyone remembers Jonathon Simmons, right? He was the ultimate Spurs success story. After going undrafted out of Houston in the 2012 NBA Draft, he was drafted by the Sugar Land Legends of the American Basketball League for its inaugural season, which was limited to just 16 games due to financial concerns. He then paid $150 to try out for the Austin Torros (now the Austin Spurs), where he made the roster and eventually became the star of the team.
Despite his success in the G League, he still considered quitting and finding a regular job so he could better take care of his four daughters, but he chose to stick with basketball, and his persistence paid off.