When the Arizona Diamondbacks announced the extensions of general manager Kevin Towers and manager Kirk Gibson in February, the team did not divulge the terms of the deals. Jon Heyman of CBSSports.com reports that both were signed to "a unique one-year extension guarantee," which takes the men through the 2015 season with the possibility for a longer stay.

Both men had two-year team options after the 2013 season, but the Diamondbacks chose to decline the options. Heyman explains what happened next:

Three months later, a compromise was reached as upper management gave them at least one extra year apiece instead. The main point of the announcement was to show that 2014 was not going to be the final year on either's contract.

In May, the Diamondbacks hired Tony La Russa as the club's chief baseball officer to oversee all the baseball operations. La Russa is now essentially is in charge of Towers and Gibson.

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From CBSSports.com:

"I'm being evaluated, as Gibby is being evaluated," Towers said. Regarding his own hopes, Towers said, "My relationship with Tony has been good. I hope to stay here."

Towers is in his fourth year as general manager in Arizona. He previously spent 14 years as the Padres GM. Gibson has managed the Diamondbacks since taking over from A.J. Hinch in July 2010. He was named the NL Manager of the Year in 2011.

The Diamondbacks are 43-57 going into Tuesday, 12.5 games behind the NL West-leading Giants.

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- Sarah Barshop