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He will do so after setting the fastest time of the year in the 200m butterfly.

Phelps, who was barred by U.S. Swimming from competing at the ongoing world championships in Russian Federation after a drink-driving arrest last year, clocked one minute, 52.94 seconds to clinch the U.S. title in San Antonio.

Sun* took silver in 1:45.20, the bronze to world record holder and the 2009 champion Paul Biedermann (GER) in 1:45.38. Ryan Lochte and Chad Le Clos finished in fourth and sixth.