ARLINGTON -- The Rangers are looking to replace the top two pitching instructors in their Minor League system after Rick Adair was hired to be the Mariners' pitching coach Wednesday.

Adair spent the past four seasons as the organization's Minor League pitching coordinator and oversaw the rapid development and improvement of the Rangers' pitching prospects. All six Rangers farm teams finished at least in the top half of their league in team pitching this past season.

The Rangers are also still looking for a pitching coach for Triple-A Oklahoma. That was Andy Hawkins' job for most of last season before becoming the club's interim Major League pitching coach. He has since been made the Rangers' bullpen coach.

Terry Clark, who was the Double-A Frisco pitching coach, is expected to fill one of those openings.

"The bigger story is this is a great opportunity for Rick," general manager Jon Daniels said. "I'm glad to see the good work that's being done in our scouting, and player development is being recognized in the industry."

The Rangers also lost one of their top amateur scouts when East Coast cross-checker Doug Harris was hired by the Indians to be a Major League scout.

"When you have success in your farm system, people start asking about the people who had a hand in that," Daniels said. "But we've still got some good people here and can fill in with some good candidates."