AP source: Giants agree to trade Chris Heston to Mariners

SAN FRANCISCO (AP) Right-hander Chris Heston has been traded from the San Francisco Giants to the Seattle Mariners for a player to be named.

The Giants did not have a spot for the 28-year-old in their rotation featuring Madison Bumgarner, Johnny Cueto, Jeff Samardzija, Matt Moore and Matt Cain. Seattle's need for additional rotation depth made the Mariners a perfect partner.

After going 12-11 as a rookie in 2015 and no-hitting the Mets on June 9 that year, Heston spent most of this season in the minors, making just four appearances for San Francisco. He went 1-1 with a 10.80 ERA in five innings of relief.

Heston showed enough as a rookie for Seattle to view him as a worthwhile option for its starting staff. The Mariners' rotation was thinned significantly when they traded Taijuan Walker to Arizona last month in a deal that brought back shortstop Jean Segura. Segura filled a crucial hole, but his acquisition came at a significant cost in Walker.

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