Arbitrators Jeanne Wood, Steven Wolf and Elizabeth Neumeier heard the case Thursday.
Barraclough was 1-6 with a 4.20 ERA in 61 games last season for Miami, which traded him to the Nationals last October. He had a $556,500 salary last year and was eligible for arbitration for the first time.
A decision also is pending for Toronto reliever Ryan Tepera, who asked for a raise from $574,700 to $1.8 million and was offered $1,525,000. Arbitrators Mark Burstein, Howard Edelman and Edna Francis heard the case Wednesday.
Tepera, a 31-year-old right-hander, was 5-5 with a 3.62 ERA last year. He was on the disabled list between June 27 and July 15 with right elbow inflammation.
Six more players remain scheduled for hearings through Feb. 15.
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