These threads only remind me that people here don't watch matches.
A day or two ago
@MichaelNadal posted a 2013 Nadal video and I was baffled to see his movement and FH. Don't think he explodes into his shots like he used to then.
Two three months ago I watched 2015 and 2007 WB F side by side, I think I made a thread here about it as well. 2015 Federer was a level below 2007.
From Federer perspective, it's about both marketing and Self motivation. If a athelete keeps saying he played better before and not now, how would he believe he can won again?