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Shaine Casas is a swimmer from the United States who set a new Americas record in the short course 4×50 meter medley relay at the 2021 FINA Short Course World Championships. The relay team of Casas, Caeleb Dressel, Ryan Murphy, and Zach Apple finished in a time of 3:15.20, breaking the previous record of 3:15.66 set by the United States team at the 2018 FINA Short Course World Championships.