Arsenio López

Lopez shortened his program at the 2004 Summer Olympics in Athens, when he swam only for the 100-meter breaststroke. He cleared a FINA B-standard entry time of 1:04.01 from the 2003 Pan American Games in Santo Domingo, Dominican Republic. He challenged seven other swimmers in the same heat as Sydney, including four-time Olympian Ratapong Sirisanont (Thailand), who was later disqualified for a false start. Lopez posted a time of 1:03.99 to take a second seed by a 1.02-second margin behind winner Jakob Johann Sveinsson of Iceland. Lopez ended his third Olympic stint by sharing a thirty-fifth place tie with New Zealand's Ben Labowitch on the morning prelims.

At the 2000 Summer Olympics in Sydney, Lopez decided to drop two of his events from Atlanta and experiment with the 100-meter breaststroke. He finished in a first-place tie with Latvia's Valērijs Kalmikovs on the fourth heat with a time of 1:04.02. In the 200-meter individual medley, he raced to a fourth seed in heat three by 0.07 seconds behind South Korea's Han Kyu-Chul in 2:06.49. Lopez did not qualify for the semifinals, finishing thirty-fourth each in all of his events from the heats.

Lopez made his Olympic debut, as a 17-year-old teen, at the 1996 Summer Olympics in Atlanta. He failed to reach the top 16 final in any of his individual events, finishing twenty-seventh in the 200-meter individual medley (2:06.99) and twenty-fifth in the 400-meter individual medley (4:34.81). He also placed seventeenth, as a member of the Puerto Rican team (including finalist Ricardo Busquets), in the 4×100-meter freestyle relay (3:28.27).

Arsenio Alexander López Rosario (born May 3, 1979), also known as Alex Lopez, is a Puerto Rican former swimmer and three-time Olympian who specialized in breaststroke and individual medley events.