Resop, 30, has spent the last two years with the Pirates. He posted a 3.91 ERA over the course of 73 2/3 innings this past season. Assuming he makes the Athletics roster out of spring training, Resop could be a valuable middle-inning reliever for the club. The veteran reliever works primarily off his fastball, which sits in the low 90s. Resop also works in a curveball and changeup, especially against left-handed batters.
Thornton spent the 2012 season at Single-A Stockton where he was 4-0 with 16 saves and a 4.53 ERA in 48 relief appearances. He allowed a .264 opponents batting average and struck out 70 while walking 19 in 53.2 innings. The 24-year-old right-hander was originally selected by Oakland in the 23rd round of the 2010 First-Year Player Draft.