OKLAHOMA CITY, Okla. -- Iowa's top-ranked and defending national champion Eric Juergens need a major decision to earn his Hawkeyes a tie, however, OSU Charles Walker had other ideas.     The fourth-ranked Cowboys notched a 21-14 win before 2,173 fans at the Myriad Convention Center in Oklahoma City. With the win, OSU rose to 2-0 on the season and 17-16-1 all-time against Iowa. The Hawkeyes fell to 2-1 on the season.     With the Cowboys clinging to a four-point lead and the 133-pound match knotted at 1-1, Walker fought off several shots from Juergens before scoring his own takedown with 27 second left in the third period. Juergens escaped with 10 second remaining, but was unable to score again, giving Walker a 3-2 win.     A technical fall at 285 pounds opened up a 18-10 OSU lead. Iowa's undersized Randy Fulsaas was in danger of being pinned the entire match as James Huml took Fulsaas down at will before earning a 20-5 technical fall at 6:08.     OSU took it's first lead of the afternoon at 197 pounds when Mark Muñoz recorded a major decision over Ryan Fulsaas 15-3, to give the Cowboys a 13-10 lead. Muñoz just missed a fall as Fulsaas' shoulders were millimeters away from the mat for the final 1:14 of the match.     The Hawkeyes opened the match with a convincing 22-8 major decision from No. 1 Doug Schwab at 141 pounds. OSU's Jerrod Sanders surrendered 10 takedowns to Schwab as Iowa broke on top 4-0.     Fourth-ranked Reggie Wright used a first-period takedown to narrowly escape Iowa's seventh-ranked Mike Zadick 4-3. Wright's victory closed the Hawkeye lead to 4-3.     Iowa's T.J. Williams, the nation's top-ranked 157-pounder, received a harder than expected battle from OSU's 16th-ranked Shane Roller. Williams scored a first-period takedown with one second on the clock that proved to be the difference. Williams fought a Roller shot late in the third period and counter with a takedown to preserve the win.     OSU sent sixth-ranked Ty Wilcox to the mat at 165 pounds. Wilcox and Iowa's Ben Shirk traded reverses during regulation and went to overtime tied at 4-4. A takedown and two back points 29 seconds into overtime gave Wilcox the dramatic victory.     At 174 pounds, Iowa extended their lead to 10-6 with a 17-14 decision from fifth-ranked Gabe McMahan.     Eighth-ranked Daniel Cormier took care of business for the Pokes at 184 pounds. Cormier won a 2-1 decision over the Hawkeyes' Jessman Smith. OSU pulled within on at 10-9 with the Cormier win.     Iowa's Jody Strittmatter, who entered the contest ranked No. 2 in the country, picked up a 12-2 major decision over OSU's Matt Brown in the 125-pound match to close the gap to 18-14.     The Cowboys will be back in action on Dec. 10 when they travel to Norman, Okla., to take on the Oklahoma Sooners at 3 p.m.