D-backs promote top prospect Ryan Waldschmidt, DFA Alek Thomas
PHOENIX — The struggling Arizona Diamondbacks shook up their roster Friday, selling their top prospect, outfielder Ryan Waldschmidtfrom Triple-A and designating veteran outfielder Alek Thomas for task. The 23-year-old Waldschmidt — who almost made the group out of spring coaching — was batting .289 with three homers, 22 RBIs and an .877 OPS at Triple-A…