KISSIMMEE, Fla. — Dan Uggla and Freddie Freeman were walking back to the Atlanta clubhouse, having finishing up a stint in the batting cages on a rainy morning, when they spotted Bryce Harper sitting at the end of the Washington dugout. They went over to shake hands and chat for a few minutes, their first chance to catch up with the Nationals young star this season. It won’t be the last time they meet.