San Francisco, CA (Sports Network) - Washington Nationals reliever Ryan Mattheus sustained a broken right hand after striking a locker following a rough outing Sunday.

The right-handed reliever gave up five runs on four hits and two walks in an inning of work during the Nats' 13-4 setback Sunday against the San Diego Padres.

Mattheus informed Nationals manager Davey Johnson of the injury just prior to Tuesday's 8-0 loss to the San Francisco Giants.

Over 14 relief appearances this season, Mattheus has posted a 4.96 earned run average with 12 strikeouts in 16 1/3 innings.

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