Lefty reliever Fernando Abad has been optioned to AAA Oklahoma City. The Astros purchased the contract of right hander Fernando Rodriguez to take Abad’s spot in the bullpen. Abad had struggled to a 1-4 record in 22 relief appearances. The move was long overdue as Abad had compiled a 15.43 E.R.A. over his last ten outings. Rodriguez joins fellow rookies Aneury Rodriguez, Jose Valdez, and Sergio Escalona on the Houston pitching staff. Rodriguez has posted 29 strikeouts and a 1.29 E.R.A. in 21 innings at AAA Oklahoma City so far this season. Rodriguez, who turns 27 next month, has spent nine seasons in the minors and appeared in one game for the Los Angeles Angels in 2009. Rodriguez has been used as both a starter and a reliever in his minor league career.