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Sure its not an L lens, but it should be a LOT sharper than the posted example.
I'd bet dollars to donuts that the kid moved in the time between focus lock and shutter release. Def not motion blur here. 1/250 should be about fast enough - wouldnt give quite this much motion blur.
The other thing that it could be is a Front or back focusing lens, which would need factory re-calibration... but like I said, I think the kid moved after focus was acheived.
OP: Try using Servo focus mode for the next basketball game, and only release shutter when your active focus point is directly on top of the part of the subject you want to be in focus, E.G. his eyes. This lens/camera combo might struggle to keep focus up with a basketball player.
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