For the first time ever, PokerStars founder Isai Scheinberg stepped out from his life of privacy to give an interview. It’s mid-December 2020 and a tennis court just north of San Jose, Costa Rica is home to one of the most hotly-contested tennis matches of the year. This isn’t a battle between a couple of former top-ranked tennis pros and the stakes aren’t all that high, but the combatants are going all out for a win.On one side of the court is a 17-year-old spending her Christmas break from sch