MS1 here, just wanted to share my experience from last year because I know how stressful this time can be. I was invited to interview with UTSW in the first group and didn’t prematch, didn’t match either. Ended up getting off the waitlist just a couple of days before the May 15th deadline. All this to say that as you go through these forums, don’t get too disheartened (although that’s human nature) when someone announces a prematch and you check your email to no avail. I do believe that a big part of my getting off the waitlist was due to sending continued update letters, and letters of intent. The last email I sent was directly to the deans and within the week I was accepted. LM77 for reference.