Toma Popov using Arc 11 pro for singles? Very unusual. I think it's because he uses it for doubles, so maybe he doesn't want to change rackets.
Bit surprised to see Mathias Christiansen switching to the BladeX 900 Moon, which Li-Ning describe as a head-light defensive racket. He'd been using the Tectonic 9 for a few years already, so he was overdue for a change, but I'd have thought the AxForce 90 or 100 would have been more obvious choices. Seems to copying his partner, who switched from Tectonic 7 to Bladex 900 Sun fairly recently...
Swing wt- 900 sun 4U- 85 900 moon 4U- 85.8, source cong vn badminton YT Moon is ever so slightly stiffer than the sun version. He used the Arc11 for a long time.