Building relationships is a vital part of being a successful pro sports agent.

Sustaining relationships is equally important, but it's an often trickier task in the cutthroat world of pro basketball. After all, agents come and go in this ultra-competitive business, and maintaining trust and meaningful two-way communication between agents and clients and teams takes skill.

Debora Zoli's expanding business is a case study in building a portfolio of success in the 21st century. She toils in a field dominated by men. Currently, her fluctuating list of clients (players and coaches) now has about 45 individuals' names on it with contracts lined up in Australia, Italy, Germany, Japan, Taiwan, Vietnam, England, the Netherlands and Hong Kong.