Definition of "backstroker"

I swam differently from the other backstrokers," he says. "

1998 August 28, Ted Kleine, “Pool Hustler”, in Chicago Reader‎

Matt Grevers was struggling to keep his head above water in a deep pool of backstrokers when a coach from the Netherlands offered him a preserver.

2008 July 13, Karen Crouse, “Wooed by Netherlands, a Swimmer Stays for the Challenge”, in New York Times‎