San Antonio will co-host the 2015 Nationwide U.S. Masters Swimming Spring National Championship April 22-26 at the Northside Swim Center. This will be the first of four national swimming championships in San Antonio this year. Registration is open for swimmers 18 and older for the USMS championship. More than 2,000 swimmers are expected to compete, including Olympian and San Antonio native Josh Davis. San Antonio Sports is looking for volunteers to serve as timers. If you can help, register at SanAntonioSports.org.