Originally Posted by Zachol82
PARTNER1 hits with more topspin than PARTNER2. I was thinking along the same line as you, a ball with a lot of topspin would feel heavier, but in this case the one with a lot of topspin was a lot "lighter" to return. PARTNER2 does use a close-stance when hitting forehands, which results in him stepping into his shots more and would probably plow through his shots more as well.
As for their frames, yes they are using different frames and that could be the reason. Still, shouldn't the "heavier" ball have more pace anyhow?
Well, you get a heavier ball when you hit through the ball and with spin. If you just brush up the back, the spin will feel light. It's easier to hit through the ball with heavy rackets, because you get the plow through feeling and the ball doesn't rocket out.