There's a shop in Morris - The Woodworkers shop they sell teak. Fixing the one slat will be a pain. trim out part of what's left make a piece, You would have to make a jig to match curve. and slip in. I'm not sure taking the deck apart to fix one slat would work without causing any more damage. my .02.
...A bad day water skiing still beats a good day at work...1995 Pro Star 205....