EXHIBIT 23.10 We hereby consent to the use in the Registration Statement of Devon Energy Corporation ("Devon") on Form S-4 and in the Proxy Statement/Prospectus of Devon and Santa Fe Snyder Corporation, which is part of the Registration Statement, of our opinion dated May 25, 2000 appearing as Annex B to such Proxy Statement/Prospectus, to the description therein of such opinion and to the references therein to our name. In giving the foregoing consent, we do not admit that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended (the "Securities Act"), or the rules and regulations promulgated thereunder, nor do we admit that we are experts with respect to any part of such Registration Statement within the meaning of the term "experts" as used in the Securities Act or the rules and regulations promulgated thereunder. MORGAN STANLEY & CO. INCORPORATED By: /s/ Stephen M. Trauber ----------------------- Stephen M. Trauber Managing Director New York, New York June 23, 2000