Nationals relief pitcher Sean Doolittle had a tumultuous 2019, proving effective but suffering from overuse before rebounding in the playoffs. Doolittle had a 2.72 ERA with a 51/11 K/BB ratio over 43 innings through July 24, when he notched the save in each game of a doubleheader. That speaks to his heavy usage, and 10 appearances later hed be placed on the 10-day Injured List with diminished velocity. His hard-hit rate was listed on Fangraphs as 29.6% in the first half, jumping to 50.7% after ...