Nadal and Federer were drawn in the same half so they are slated to meet in the semi final assuming either of them survive that long. Nadal has a relatively easier draw with Mayer then Dolgopolov and Goffin or Monfils. Federer on the other hand has Feliciano Lopez, Kohlschreiber, then Del Potro or Thiem. Thiem looks really good right now to win that quarter.

Querrey, M. Zverev, Shapovalov, and Pouille all have a chance to emerge from the decimated bottom half.

I'll definitely use the point system based on 3 suggestions already, thank you.