Eren
Professional
Big4 in slam finals against non-big4: 22 wins and 4 losses.
3 losses to Wawrinka who had 3 and a half years at ATG level.
1 loss to Del Potro who is a big talent held down by injuries.
Nadal was injured though in 2014 AO F. A bit unfair to put that on Nadal but a win is a win and Wawrinka did beat Djokovic in QF, so ok but it might have been only two losses in an ideal world.