Beat Stephens and, almost certainly, Erakovic faces the shrieking second seed Maria Sharapova. Still, one step at a time, just as it is for Castle, who is moving on from her successful stint as chief executive of Netball New Zealand.
With due respect to that sport, Castle faces a larger, and potentially more bruising challenge overseeing the Bulldogs of the National Rugby League. The daughter of a former Kiwis captain, Bruce Castle, she grew up in a league household, so she'll know her five-tackle kick rule.
But imagine the first meeting of the NRL chief executives. Where once it was 16 men hunched around a table, sleeves rolled up engaged in robust conversation over the game's issues, now it'll be 15 men and a woman. Just one seat, but a significantly changed dynamic in the room.
Let's be clear. This isn't tokenism. What would possibly persuade the Bulldogs, who have had their share of ugly off-field issues in the past decade, to think hiring a woman now is going to rectify an image problem?
If they were of that mind, it would have been done at any of the points where they had transgressed.
Call Castle's appointment a merit-based selection if you will. At that level you don't mess about with popularity contests. You want the best person in the key roles. In the board's view, Castle was the best candidate, ergo a straightforward decision.
Her people skills are strong and she is not afraid to back policies which aren't surefire winners. Witness the restructuring of netball into zones (a hit) or trying to get Cathrine Latu into a black singlet for the 2011 world champs (a miss).
Castle also doesn't appeal as someone who'll roll over to the heavy mob. Not that she needs it, but all power to her arm.
