Atlanta Braves catcher Travis d'Arnaud (concussion) will begin a minor-league rehab assignment with Triple-A Gwinnett on Friday. After some struggles with concussion symptoms after suffering a head injury almost a month ago, d'Arnaud has been cleared by doctors to start playing in minor-league games. As long as the 34-year-old doesn't see a return of concussion symptoms, specifically headaches, he should be ready to return from the injured list sometime next week. He was hitting a strong .333 ...