All those excuses I've seen for all the Big 3 or other players.
I've seen excuses for all his 3 losses at RG, his defeat vs Federer at AO 2017, Wimbledon 2018 vs Djokovic, Rosol Wimbledon 2012, del Potro USO 2009, Ferrer AO 2011, Murray AO 2010, Murray USO 2008, etc.