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Oct 12 2015: Jonathan Guiza places 3rd at the Men Junior 17-18 Race at the Jamestown Classic in a field sprint
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Sep 20 2015: Jonathan Guiza places 3rd at the Men Junior 17-18 Race at the Connecticut Cycling Festival in a field sprint
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Aug 15 2015: Jonathan Guiza places 3rd at the JUNIOR 17-18 Race at the Bob Beal Memorial Race Weekend - 2015 New England Time Trial Championships
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Aug 9 2015: Jonathan Guiza places 7th at the Juniors 15-18 (Cat 1-5) Race at the Tokeneke Classic Road Race in a group sprint
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Aug 1 2015: Jonathan Guiza places 16th at the Men 5/Junior Boys 15-18 Race at the 35th Annual Concord Criterium in a group sprint