IowaGuy
Hall of Fame
@IowaGuy You do realize who his opponent is on that video, right? Also, I played Matt. I kind of have first hand experience.
His opponent is excellent. Matt looks like a very good player as well, great groundies and movement.
But it seems to me that in that match Matt would be just as effective using all 2nd serves, as he basically gets no free points on his 1st serve. Therefore, his serve is not a weapon against that opponent. Not attackable, but also not a weapon.
Some ATP players (a few) are similar, they rely on their groundies without a serve for a weapon. Think Diego Schwartzman or early Michael Chang. Their goal is to get a high % 1st serve in, and start the rally from there.
Schwartzman, for example, against Tsitsipas in Barcelona 2018, got >80% of his 1st serves in, but won just over 50% of those points. Therefore, his serve was not a weapon against Tsitipas.