11:19pm: The Orioles and another team have already offered Ayala contracts, FOX Sports' Ken Rosenthal reports (Twitter link). Ayala is weighing the two offers and will likely make his choice on Thursday.
12:49pm: The Nationals have granted right-hander Luis Ayala his unconditional release, tweets Mark Zuckerman of CSN Washington. The veteran reliever will head home to Arizona with the hope of signing on with another club quickly, he adds.
The 36-year-old Ayala struggled in camp with the Nationals, allowing nine runs on 10 hits and a pair of walks with three strikeouts in six innings of work. However, he's coming off a strong performance with the Braves in 2013, in which he pitched to a 2.90 ERA with 5.8 K/9, 3.8 BB/9 and a 59.6 percent ground-ball rate in 31 innings of work. He did miss a chunk of the season on the disabled list as he dealt with anxiety disorder, but a 2.73 ERA in 26 1/3 innings following that DL stint seems to indicate that he was able to work through the issue.
Ayala drew interest from a number of clubs this offseason, including the Mariners, Tigers and Indians, so he could land another shot to prove himself with a different club despite the early struggles in Spring Training.