Rockies activated C Wil Nieves from the 15-day disabled list; designated him for assignment. Nieves batted .298 (14-for-47) with a home run and five RBI in 16 games with the Rockies this season prior to hitting the disabled list in the early part of July with turf toe. He's just a .226 hitter in the big leagues, but could draw interest from a catching-starved team.