Venus, Serena Williams play tennis with Jamaican sprint stars

It’s unlikely that Venus and Serena Williams have ever played against a doubles team with four Olympic medals between them. But that’s what happened in an impromptu exhibition at a Treasure Beach clinic in Jamaica on Saturday. The Williams sisters, each with four Olympic gold medals (three doubles, one singles), faced off with Jamaican sprinters Yohan Blake and Warren Weir. Blake…