Only 10% of the world is left handed, so why are so many athletes lefties?

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Sources:
http://www.tandfonline.com/doi/abs/10.1080/1357650X.2014.961471?journalCode=plat20
http://rsif.royalsocietypublishing.org/content/royinterface/9/75/2718.full.pdf
http://rspb.royalsocietypublishing.org/content/263/1377/1627
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2666081/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4014306/
http://www.sciencedirect.com/science/article/pii/S0003347281801170
http://faculty.knox.edu/jtemplet/AmNatProducerScrounger.pdf
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0105800
http://www.tandfonline.com/doi/abs/10.1080/1357650X.2014.961471?journalCode=plat20&