It was no surprise that the team elected to tender contracts to all six arbitration-eligible players. General manager Dave Stewart had said during last month's General Managers Meetings that the team would indeed tender a contract to Pennington.
The only question after that was whether the D-backs would tender a contract to reliever Hernandez, who missed all of last season due to Tommy John surgery. The right-hander is expected to be back near the beginning of the 2015 season.
An elbow injury kept Hernandez from appearing in a regular-season game last year, the final year of a two-year, $3.5 million extension he signed in 2012.
The six arbitration-eligible players must file for arbitration on Jan. 13. The two sides will exchange proposed salary figures for the 2015 season on Jan. 16 and, if necessary, arbitration hearings are scheduled to take place from Feb. 1-21.
The two sides can reach an agreement any time before the arbitrator announces the decision.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.