JJGUY
Hall of Fame
He's not petering out. It has nothing to do with stamina, and surely he's not lazy.
Zverev clearly has an acute case of slamidous.
well, depends on how we define "lazy", I am sure he trains very hard, but on court he wants an "easy" or "manageable" win, he shows very little interest fighting back from huge deficit, he would just settle with a breadstick instead of fighting for a couple more games. Probably in his mindset, it's not worth the effort since he is way behind in the set, but that sort of lack of fighting spirit is just lazy.