Washington Nationals right-hander Trevor Williams said Wednesday night that an MRI exam of his elbow revealed a partial tear of the ulnar collateral ligament, and he will undergo surgery next week that will keep him out until at least next season. Midseason grades for all 30 MLB teams: ‘A’ is for Astros, ‘F’ is for …? Williams, who re-signed with Washington on a $14 million, two-year deal last winter, has been limited to only 30 starts over the past two seasons because of arm problems. The 33-year-old Williams only has a partial tear of the ligament, and the hope is an internal brace procedure will be enough to treat the injury.