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Martin tweets he's not working with Roush drivers

Veteran driver rejoined team in 2014 as driver development coach

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Mark Martin, a 35-time NASCAR Sprint Cup Series winner with Roush Fenway Racing (then Roush Racing), said Friday via Twitter that he is no longer with RFR.

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Martin had rejoined the organization this past July, signing on as a driver development coach to work with young drivers Ricky Stenhouse Jr. and Trevor Bayne, who will begin his first full-time Cup season this year.

At the time, Martin said, "I'm excited to return to Roush Fenway Racing, as it feels like I'm going home to where I belong. I was fortunate to help build this team from the beginning and it's very humbling to be a part of Jack's team again."

Martin, 56, had previously been in a consulting role with Stewart-Haas Racing, the last team he drove for in the Sprint Cup Series.

On Saturday, Martin responded to a question on Twitter with the following reason for not wanting to work with Roush anymore.