Vallmitjana is the 10th-fastest 17-year-old in the 800 free in the U.S. club system over the past decade, now sitting 25th all-time in the 17-18 age group. Current photo via Chris Pose
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Juan Vallmitjana, a Spanish native who competes for the South Florida Aquatic Club, was on fire at last week’s Fort Lauderdale Open, setting four best times and earning a pair of podium finishes in the distance freestyle events…