The Reds on Friday activated lefty reliever Aroldis Chapman from the 15-day disabled list and optioned lefty reliever Jeremy Horst to Triple-A Louisville. Chapman had been on the DL since May 16 with left shoulder inflammation, but he has been physically healthy for some time now. However, the southpaw was given extended time to get his command together after experiencing wildness and mechanical issues. This season for the Reds, Chapman has 20 walks and 15 strikeouts in 13 innings and a 6.92 ERA over 16 games.