Pestano, 29, has spent most of the season in Triple-A, where he had a 1.78 ERA with a 37/12 K/BB in 30 1/3 relief innings. He's thrown nine innings with the Tribe (5.00 ERA). Pestano battled injury and ineffectiveness last year (4.08 ERA) but was a dominant setup man from 2011-12 (2.45 ERA and 10.9 K/9).
The Halos added Huston Street, Jason Grilli and Joe Thatcher to their bullpen in the weeks leading up to the trade deadline. (Thatcher is currently on the DL with a foot injury.) Pestano will join that group as well as former Indians teammate Joe Smith to form the core of Mike Scioscia's stretch run bullpen.
Clevinger, 23, has a 4.31 ERA and a 9.6 K/9 in 18 starts and 79 1/3 innings split between two Single-A levels this year. He was Anaheim's fourth round pick in the 2011 draft. Baseball America ranked him as the team's 17th best prospect before the season, saying he may only be a reliever long-term.