Preparing the Bridgehampton grounds for the horses, riders, and thousands of people who will return to the weeklong Hampton Classic starting Sunday began almost the minute last year’s show ended.

Swimmers ages 7 through 79 churned the water in Bill and Dominique Kahn’s 25-yard pool here Saturday, raising money for pancreatic cancer research and evoking the spirit of the late Dr. Charles van der Horst, a retired University of North Carolina medical professor internationally known for his work with AIDS patients.

Kal Lewis, a Shelter Island High School miler and cross-country runner, led a field of almost 800 over the Ellen’s Run 5K course in Southampton Sunday, breaking the tape in front of Stony Brook Southampton Hospital’s Parrish Hall in 16 minutes and 15.90 seconds.

The Long Island Ducks, coming off a four-game winning streak and now leading the Atlantic League’s Liberty Division, will be at home all week in Central Islip.