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I don't do sports photography, so take my comments with a grain of salt ... about the size of a cow lick. They are made from the view to general guidelines for building a portfolio. It should be brief. Only your best and strongest and selected to appeal to your specific audience. You might receive useful sports specific advice from the "Sports Corner" forum.
Hard to identify the individual images. Best I could do is count. The 9, 11, 12 and 13 are images that probably aren't helping the portfolio much. The ball carrier laying down is nice enough as part of a specific story, but is it helping you portfolio? Same question for the fan showing his shirt. A performance on a guitar? Yes, the dog is good and he's competing, but are you trying to appeal to folks that are primarily interested in human sports? If you are directing the portfolio for a specific type of sport, then you probably ought to concentrate the portfolio on that sport.