Pretty much all those reasons plus horrible sticky courts, windy conditions and top players generally playing poorly, tanking or not participating.
Sent from Verticalsports.com Free App
OK, but some of these things are factors that are not specific to the tournament, e.g. the fact that Fed is declining and running a light schedule, Rafa is nursing himself back a little bit, especially on hard courts. The wind - not sure how windy Miami is on average, but I think Indian Wells suffers a lot more from wind. Sticky courts: not sure exactly what you mean there. I guess Miami is definitely a humid place, but I have heard more complaints over the years about the courts at Indian Wells given how slow they are - suits Rafa though, I guess.