 O'Flaherty was particularly effective against left-handed batters, who hit only .215 and posted a .270 on base average and a .290 slugging average off of him.O'Flaherty served as an important part of the Braves bullpen during the 2011 season where he pitched primarily during the 7th inning.Along with Craig Kimbrel and Jonny Venters, the three formed the back end of the Braves bullpen.