My middle school son and I played fantasy basketball this year for the first time as something to do together. What started as an afterthought became something we did together every day. And we ended up winning. It was stressful and exciting as we got closer to the end. The lessons were the same as building a $100m start-up in so many ways.

Here's four things we learned running a start-up which we used in winning our fantasy hoops league: