Kansas City, Mo. - The upsets continued during the quarterfinal session of the 2003 NCAA Division I Wrestling Championships, but the one thing that remained constant was Oklahoma State keeping the team lead.    The Cowboys are still in first place with 78 team points and have eight wrestlers still alive in the tournament, including Johnny Thompson (133 lbs.), Jerrod Sanders (149), Tyrone Lewis (174), Jake Rosholt (184) and Muhammed Lawal (197), who will all compete in tonight's semifinals.    Two-time defending national champion Minnesota is in second place with 56 team points, followed by Oklahoma (51.5), Lehigh (50.5) and Iowa (42) in the top five.    Two more lower seeded wrestlers advanced to the semifinals at 157 lbs., led by No. 9 seed Alex Tirapelle's 2-1 tiebreaker win over defending national champion Luke Becker of Minnesota. Tirapelle, a freshman at Illinois and the younger brother of 2002 NCAA champion Adam Tirapelle, kept the pace of the match slow while showing great patience offensively.    In the tiebreaker, Tirapelle won the coin flip, chose bottom, and Becker was called for locked hands, giving the final point to the Illinois youngster. Tirapelle will face All-American Scott Owen of Northern Illinois in the semifinals. Owen defeated Gray Maynard of Michigan State 4-2 in overtime.    "I got at him at a perfect time," the younger Tirapelle said. "I had a game plan. He didn't push the action. I didn't either. It came down to who scored first. The amount of pressure relieved when you win the quarterfinals is amazing. Now it is about how far do you want to go. I was a little nervous before. It is a big time show."    On the other side of the 157-pound bracket, Ryan Bertin of Michigan pulled out a 3-1 victory over third-seeded Shane Roller of Oklahoma State. Bertin will now face Keaton Anderson of Ohio State in the semifinals. Anderson continued his impressive and courageous journey through the bracket with a 7-3 win over Derek Zinck of Lehigh.    "I came out real focused," Bertin stated. "I wrestled hard. I had to wrestle smart and not get into scramble positions. I had to stay solid. It worked out there. You never know what will happen in this tournament."    "I am feeling great. I have never been an All-American before. That clinched it. Now I have to keep going hard, and come back tonight ready to go," Anderson said.    Anderson tore his ACL at the Big Ten Championships just two weeks ago, but is wearing a large brace on his left knee and has showed no visible effects of the injury.    At 184 lbs., freshman Jake Rosholt of Oklahoma State continued his surprising run through the bottom half of the bracket with a first-period pin over 2002 NCAA finalist Greg Parker of Princeton. Rosholt will get a rematch with Josh Lambrecht of Oklahoma, who pinned No. 2 seed Clint Wattenberg of Cornell in the second period.    Lambrecht and Rosholt have met several times this season with Rosholt defeating Lambrecht in their last meeting. This semifinal matchup will have more at stake that in past meetings.    Robbie Waller of Oklahoma remains as the only highly seeded wrestler left on the championship side of the 174-pound bracket. Waller pinned All-American Mark Fee of Appalachian State in the first period to advance to the semifinals, where he will face upset-minded Brad Dillon of Lehigh.    Dillon defeated second-seeded Chris Pendleton of Oklahoma State 3-2.    Also coming away with a 3-2 win was Shane Webster of Oregon, who downed All-American Tyler Nixt of Iowa in the quarterfinals. Webster will meet up with unseeded Carl Fronhofer of Pittsburgh in the semifinals.    At 197 lbs., returning NCAA finalist Jon Trenge of Lehigh was able to cradle Kyle Smith of Michigan late in the match to come away with a pin. Trailing 3-1, Smith locked up a cradle with 15 seconds left in the match, but he stepped the wrong way with the move and Trenge was able to lock a cradle of his own for the fall.    Jason Mester of Central Michigan defeated defending NCAA champion Aaron Holker 11-3 in the quarterfinals. Mester becomes the first semifinalist for the Chippewas since Ryan Cunningham in 2000. He is also looking to become Central Michigan's second national champion ever.    He will now face top-seeded Teyon Ware of Oklahoma in the semifinals.    "It's big. Beating him is big on my list. He beat me last year. You can't get cocky. I have the semis coming up and that's what I am thinking about. I can't jump to conclusions," Mester said. "I'm looking to be No. 2 (at CMU). That is the only goal. There is nothing else. Anything but the national title is disappointing to me."    The top four seeds all advanced at 125, 165 and 285 lbs.    The semifinals will begin at 5:30 p.m. Central Time. Continue to log on to TheMat.com for complete coverage of the 2003 NCAA Championships, including a live audio broadcast.      2003 NCAA Championships  Semifinal Matchups  125  Chris Fleeger (Purdue) vs. A.J. Grant (Michigan)  Ben VonBaur (Boise State) vs. Travis Lee (Cornell)    133  Johnny Thompson (Oklahoma State) vs. Rad Martinez (Clarion)  Ryan Lewis (Minnesota) vs. Cliff Moore (Iowa)    141  Teyon Ware (Oklahoma) vs. Jason Mester (Central Michigan)  Dylan Long (Northern Iowa) vs. Shane Cunanan (West Virginia)    149  Eric Larkin (Arizona State) vs. Jerrod Sanders (Oklahoma State)  Jesse Jantzen (Harvard) vs. Jared Lawrence (Minnesota)    157  Alex Tirapelle (Illinois) vs. Scott Owen (Northern Illinois)  Ryan Bertin (Michigan) vs. Keaton Anderson (Ohio State)    165  Matt Lackey (Illinois) vs. Jacob Volkmann (Minnesota)  Tyrone Lewis (Oklahoma State) vs. Troy Letters (Lehigh)    174  Carl Fronhofer (Pittsburgh) vs. Shane Webster (Oregon)  Robbie Waller (Oklahoma) vs. Brad Dillon (Lehigh)    184  Jessman Smith (Iowa) vs. Scott Barker (Missouri)  Josh Lambrecht (Oklahoma) vs. Jake Rosholt (Oklahoma State)    197  Jon Trenge (Lehigh) vs. Chris Skretkowicz (Hofstra)  Damion Hahn (Minnesota) vs. Muhammed Lawal (Oklahoma State)    285  Steve Mocco (Iowa) vs. Kellan Fluckiger (Arizona State)  Tommy Rowlands (Ohio State) vs. Kevin Hoy (Air Force)