In his own words...
https://www.si.com/college/recruiti...en-martin-details-college-commitment-via-blog
"Everything has been great, I made my decision for the school I wanna attend on Wednesday. The school I picked, Miami, was because they have great coaches, a great history of developing players. I love the school. I always kind of felt like this was the school for me. It was kind of down to three schools, but picking this one for me was about the environment and their winning program.
They're doing a great job this year on baseball and football is doing a good job, too. Can't wait to see what they have in the future. Can't wait to add on to their program!"
Also said there is a certain pick and $ number for determining going pro over college.