IRVING, Texas (AP) The Dallas Cowboys have locked up center Travis Frederick with a long-term contract.

The Cowboys signed the two-time Pro Bowl player to a six-year, $56 million extension that runs through 2023 after agreeing to terms just before the preseason opener at the Los Angeles Rams on Saturday. The average of $9.1 per season makes him the NFL's highest-paid center.

Frederick, drafted 31st overall in 2013, was the second of three first-round picks on the offensive line by Dallas in a four-year span starting with left tackle Tyron Smith in 2011. Left guard Zack Martin was the team's top selection in 2014.

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Smith is also signed through 2023, and an extension for Martin is likely to be an issue next summer.

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