Now that the basketball season is underway, I'm shooting games frequently. The main reason for discards is focus errors. I understand this is typical. I'd like a discussion of what works best. Here's what I've found: I use the center spot only. After reading an article about back-button focus I tried this technique. Focus errors increased. I got a handgrip/battery pack to make it easier to shoot vertical (basketball is a vertical game). Focus errors dropped. I hadn't expected this. I'm wondering of the feel of the shutter release makes a difference. I also had fewer slanted shots that needed to be rotated a few degrees. I expected this. What other techniques have worked?