Rockies placed INF Chris Nelson on the 15-day disabled list, retroactive to July 16, with an irregular heartbeat. Nelson had a successful procedure Tuesday to shock his heart back into rhythm and it expected to be OK, but the Rockies didn't want to take any chances. He could be back when first eligible. "Due to the fact that [his heart] was not able to go back into rhythm on its own, there's at least six or seven days of very limited activity he'll have," manager Jim Tracy said. "As a result, we had to put him on the disabled list."