1. It’s one of the newest major tournaments
Tennis has one of the longest histories of any modern sport, so it’s pretty rare that a new tournament gets started in the modern era. The Miami Open was started in 1985 by pro player Butch Buchholz (for comparison, the first Wimbledon championships were held in 1877). This is even more impressive when you consider how big the Open has become in such a short time.
2. They give away roughly two M1 Abrams tanks-worth of prize money
The Miami Open needed to make a name for themselves when the tournament first started, and they definitely succeeded. Part of their strategy to get on the map of major tournaments was to offer up some of the largest cash prizes for winners, at the time only topped by the U.S. Open and Wimbledon. In 2015, the total cash money given out was over $12 million (yep, that's about two tanks worth of cash), with the singles finalists taking home $900,000 of that.