When you have things that are moving quickly, the trick is to change the focus setting to AF-C and put it in burst mode. Focus on the skater while she's out somewhere and track her for a little bit--you will get her in focus soon enough. When you do, fire away! (You'll need a shutter speed of at least 1/400 for fast moving people and athletes.) Of the 4 or 5 images you'll get, one or two will come out in focus.
The second one of these is pretty nice; if you had nailed the focus, it would be a real stunner!
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