U.S. Open (swimming)

The U.S. Open Swimming Championships, or U.S. Open, is a championship meet organized by USA Swimming which is open to international teams/swimmers. It was first held in 1985, and was held annually in December through 2006. Beginning in 2007, the meet's first-weekend-of-December timing was given over to the resurrected USA Short Course Nationals, and the U.S. Open moved to being held on an as-needed basis. From 2007 to 2017, the meet was held in early August, in years where the U.S. Nationals were not held in August. In recent years, the meet has returned to the end of the calendar year.
The meet is traditionally a long course meet, although twice has been swum short course meters : in 1996 and in 1998.