DALLAS - Oklahoma State senior Reggie Wright was selected as Big 12 Wrestler of the Week as announced by the conference office Tuesday.    Wright, the top-ranked wrestler in the nation at 149 pounds, went 2-0 last week while improving his season record to 26-0. He joins Iowa State's Cael Sanderson and Oklahoma's Michael Lightner as the only three Big 12 wrestlers to remain undefeated this season.    The Chicago, Ill., native earned a decision over Arizona State's Dana Holland in the Cowboys' 31-7 win over the Sun Devils on Feb. 16. Wright returned home on Feb. 18 to face Oklahoma's ninth-ranked Jared Frayer. In front of 10,802 fans at Gallagher-Iba Arena, Wright beat Frayer 7-2 to run his career record against the Sooners' 149-pounder to 9-0.    No. 2 Oklahoma State finished the regular season with a 17-1 overall record and 6-0 in conference action. The Cowboys are off until they defend last year's conference title in Stillwater, Okla., on March 2-3 at the Big 12 Wrestling Championships.    2000-01 Big 12 Wrestlers of the Week    Date, Name, School, Year, Weight Division  Dec. 13, 2000 - Charles Walker, Oklahoma State, Sr., 133 pounds  Dec. 18, 2000 - Bryan Snyder, Nebraska, Jr., 157 pounds  Jan. 8, 2001 - Cael Sanderson, Iowa State, Jr., 184 pounds & Daniel Cormier, Oklahoma State, Sr., 184 pounds  Jan. 16, 2001 - Michael Lightner, Oklahoma, Sr., 141 pounds  Jan. 23, 2001 - Michael Barger, Oklahoma, Jr., 174 pounds  Jan. 29, 2001 -  John Kopnisky, Missouri, Jr., 174 pounds  Feb. 6, 2001  - Matt Azevedo, Iowa State, Sr., 133 pounds  Feb. 12, 2001 - Waymon May, Oklahoma, Sr., 197 pounds  Feb. 19, 2001 - Reggie Wright, Oklahoma State, Sr., 149 pounds