Two weight classes have all four top seeds advance    Seeding is an inexact science, and rarely does the top four seeds in every weight class advance to the semifinals in their weight class at the NCAA Div. I Championships.    There were two weight classes which saw their top four seeds advance to Friday night's semifinals, 165 pounds and heavyweight.    The 165-pound semifinalists are No. 1 Troy Letters of Lehigh, No. 2 Ryan Churella of Michigan, No. 3 Johny Hendricks of Oklahoma State and No. 4 Mark Perry of Iowa.    The heavyweight semifinalists are No. 1 Steven Mocco of Oklahoma State, No. 2 Cole Konrad of Minnesota, No. 3 Cain Velasquez of Arizona State and No. 4 Pat DeGain of Indiana.    Four weight classes had the No. 1, No. 2, No.3 and No. 5 advance: 125 pounds, 133 pounds, 149 pounds and 174 pounds,     Update on freshmen, as three are moving on    On Thursday, TheMat.com featured the talented freshmen entered in this tournament. Three freshmen advanced to the NCAA semifinals with wins Friday morning.    Included is No. 3 Mack Reiter of Minnesota (133), who stopped unseeded Chad Mendez of Cal Poly, 8-3 in the quarterfinals.     Also reaching the semifinals is No. 5 Eric Tannenbaum of Michigan (149) who defeated No. 4 Matt Storniolo of Oklahoma, 4-3.    Joining the semifinalists from the freshman class was No. 4 Mark Perry of Iowa, who defeated No. 5 Tyron Woodley of Missouri, 5-3.    No. 1 seed upset at 157 pounds    It isn't often that a No. 8 seed knocks off a No. 1 seed in the quarterfinals of the NCAA Div. I Championships, but the 157-pound weight class saw No. 8 Joe Johnston of Iowa edge No. 1 Alex Tirapelle, the Big Ten champion, by a 6-5 margin. It was a big boost for the Iowa team, which entered the tournament hoping to remain in the mix among the top programs in the nation. Iowa was in eighth place in the team standings after the quarterfinals, with two in the semifinals.    All of the other No. 1 seeded wrestlers advanced to the semifinals with wins Friday morning.    The victory by Johnston was not the only unexpected outcome at the weight class. Only one of the top four seeds were able to advance, No. 2 Ryan Bertin (a 2003 NCAA champion).    The semifinals at 157 pounds will be:  No. 5 Jake Percival of Ohio vs. No. 8 Joe Johnston of Iowa  No. 2 Ryan Bertin of Michigan vs. No. 6 Travis Paulson of Iowa State    Losing in the semifinals at the division were a past NCAA champion and a past NCAA runnerup. Returning national champion Matt Gentry of Stanford lost to Paulson, 8-6 in overtime, while 2003 NCAA runner-up Tirapelle was defeated by Johnston.    Cornell University seeking highest finish ever    At the conclusion of the semifinal round, Cornell was in second place in the team standings with 55 points. The Big Red trailed Oklahoma State by 23.5 points at the time, but had a 7.5 point lead over third-place Michigan.    Cornell's top NCAA finish in history was its 3rd place in 1952-53 under coach Jimmy Miller. Cornell had five NCAA qualifiers that year, with two individual champions, Frank Bettuci at 147 pounds and Don Dickason at 167 pounds.    Cornell was also 7th in the 1957-58 NCAA Championships under Miller. The team's highest placement under current coach Rob Koll was 10th in 2002-03.    Oklahoma State continues to get bonus points    In its quest to continue its dominance in college wrestling, Oklahoma State not only was able to move five athletes into the semifinals this year, but was also adding bonus points during the tough quarterfinal round. Champion teams not only score points from advancement but also capture as many bonus points as possible, a formula perfected under the champion Iowa teams coached by Dan Gable.    At 165 pounds, No. 3 Johny Hendricks scored a pin over Jon Sioredas of UT-Chattanooga in 6:20. At 174 pounds, No. 1 Chris Pendleton added a 17-1 technical fall over Eric Hauan of Northern Iowa.      Other Notes    Past NCAA champions in the semifinals are Travis Lee of Cornell at 133 pounds, Teyon Ware of Oklahoma at 141 pounds, Ryan Bertin of Michigan at 157 pounds, Troy Letters of Lehigh at 165 pounds, Chris Pendleton of Oklahoma State at 174 pounds, Greg Jones of West Virginia at 184 pounds, Jake Rosholt of Oklahoma State at 197 pounds and Steven Mocco of Oklahoma State at heavyweight    Sam Hazewinkel of Oklahoma (125) avenged his only loss of the year, beating No. 9 Coleman Scott of Oklahoma State, 2-0 in the quarterfinals. Scott upset Hazewinkel in the Big XII finals two weeks ago in Omaha, Neb…    Travis Lee of Cornell (133), a 2002 champion, got taken down in the first period of his quarterfinals match against No. 8 Scott Jorgensen of Boise State. This happens at times with Lee, who never seems to panic if he gets behind. Lee opened up his offense as the match went along, to win, 9-3.     Sandy Stevens, the voice of the NCAA Championships for many years, had to sit out the morning session of the tournament with a sore voice. The tournament was able to move forward with professionalism, as Don Blasingame of Oklahoma, an Olympic announcer and veteran of major USA Wrestling, college and high school events…    Wrestlers from other nations are becoming a more common part of the NCAA Championships. Alive in the wrestlebacks is Jon Masa (Rodriguez) of Hofstra, who lost in the semifinals to Zack Esposito of Oklahoma State at 149 pounds and needs one more win to be an All-American. Payam Zarrinpour of Sacred Heart, who was a top Greco-Roman wrestler from Iran before coming to the United States to compete in college, won his consolation match Friday morning against Bode Ogunwale of Harvard, 4-3 and remains alive for All-American honors. Another "international" athlete who has been eliminated is  Muzaffar Abdurakhmanov of American, who was seeded No. 4 at 157 pounds but lost twice and is out.