The biggest thing I noticed was that he missed 4 shots and made 6.
This is exactly how practice should be done.
Like Thiem hitting half his feed balls long/net, one thing I’ve always done is never apologize for an out ball during practice rally.
I even say to hitting partner, “Don’t worry about my enjoyment. Go for your shots, hit big, hit long, this is what practice is for. Close out short balls”
I only practice with people who get this. This also raises the level of ball that gets hit to me.
This is why playing USTA before strokes are developed is the #1 tennis development killer.
Result is someone who is terrified of making errors who never learns to hit a tennis ball.
Doubles is even worse b/c there is a team needing points for pointless “sectionals”, and a hacker pusher partner who wants to win.
That is why they never develop a true free swing, even after many years of playing
Like Thiem demonstrates, failure is endemic to successful practice.
Let me say it again, he missed almost half of the hand feeds.
The simple truth is that most people are not mentally equipped to improve at tennis.
If you’re not spraying balls like Thiem, you’re not pushing your envelope.