KENOSHA, Wis. - North Dakota State's two-year reign as NCAA Division II champion hangs in the balance after Friday's first day of the national tournament at Wisconsin-Parkside.    The Bison trail Central Oklahoma by 3.5 points heading into Saturday's final day, and the Bronco's seem to hold the cards going into the semifinals.    Central Oklahoma made the most of their eight qualifiers, putting six into the semifinals. But that was of little comfort to coach David James.    "By no means is this tournament over, but it was good to get six into the semis," he said. "We knew coming in that we were a couple of guys short, so we had to get the most out of our kids and I'm proud of that."  The new bracketing format -- which placed wrestlers based on their regional finish rather than the traditional seeding format -- produced several early matchups between highly-ranked wrestlers and resulted in a number of upsets.    The first major upset of the day came at 133 pounds when top-ranked and once-beaten Chris Peretti of Ashland lost in double-overtime to Jared Haberman of Western State, who went on to knock off fourth-ranked Jake Thielbar of North Dakota State.    While Haberman rode into the semifinals, Peretti went 0-2 in the tournament, falling to Rob Jankowski of the host Rangers 6-4.  "That was disappointing," Ashland coach Ray Konatch said. "We were happy to get six All-Americans in, but to have a guy who's lost once all year go two-and-out was really tough."    Central Oklahoma looked poised to run away with the team title after a strong quarterfinal round, but the defending champs made a strong case in the second round of consolations, winning all five matches to pull ahead of Ashland into the runner-up slot.    "After the semis tomorrow, we'll really know," coach Bucky Maughan said. "Right now, they're the team to beat with six in the semis. We were able to get five through in the wrestlebacks and we'll have to wrestle well."  The Bison's returning champions, Todd Fuller (174) and Nick Severson (HWT) both avoided the upset bug and advanced to the semifinals.  Peretti wasn't the only top-ranked wrestler to go down to defeat on Friday. Central Oklahoma's Michael Barreras was a first-round victim to Ricky Garcia of San Francisco State, as Garcia posted an 8-1 victory.  Second-ranked heavyweight Josh Hendricks lost in the quarterfinals to Dupree Lacey of Central Washington, and 2000 champion Jon Madsen of South Dakota State was a first-round victim to Lyneil Mitchell of Gannon University.    Day One Team Standings  Central Oklahoma 61.5, North Dakota State 58, Ashland University 46, South Dakota State 35.5, Findlay 32, Nebraska-Omaha 32, Western State 30.5, Central Washington 30, Augustana 29.5, Pitt-Johnstown 29, Nebraska-Kearney 27.5, Wisconsin Parkside 25, Minnesota-Mankato 23.5, Adams State 23, San Francisco State 18.5, St. Cloud State 14.5, Gannon University 13.5, Central Missouri State 12.5, Northern COlorado 12.5, Chadron State 10.5, Kutztown 8, Mercyhurst 7.5, Fort Hays State 5, West Liberty State 4.5, Indianapolis 3, Colorado School of Mines 2.5, Southern Illinois-Edwardsville 2.5, Northern State 2, Truman State 1.5, Minnesota-Moorhead 1, Minnesota-Morris 1, Carson Newman 0.5, American International 0, Southwest State 0, UNC-Pembroke 0.     Semifinal Matchups  125- Brandon Newill (Pitt.-Johnstown) vs. Anthony Guillen (Western State). Bryce Abbey (Nebraska-Kearney) vs. Chris Saferite (Central Oklahoma).  133- Jared Haberman (Western State) vs. Jimmy Melek (Adams State). Cole Province (Central Oklahoma) vs. Tony Fratzke (Minnesota-Mankato).  141- Ronnie Stafford (Northern Colorado) vs. Matt Dodgen (Central Oklahoma). Chris Shears (Ashland) vs. Roderick Ratcliff (Nebraska-Omaha).  149- Waylon Lowe (Findlay) vs. Brandon Pfizenmaier (Nebraska-Kearney). Adrian Jiron (Western State) vs. Ryan Wirtzberger (Ashland).  157- Shad Benton (Pitt.-Johnstown) vs. Aaron Veskrna (South Dakota State). Gary Skoch (Ashland) vs. Paul Carlson (North Dakota State).  165- Zach Davis (Ashland) vs. Shawn Silvis (Central Oklahoma). Todd Kirkpatrick (Augustana) vs. Tyler Bryant (South Dakota State).  174- Jon Duncombe (St. Cloud State) vs. Todd Fuller (North Dakota State). Bob Edmonds (Nebraska-Omaha) vs. Tom Meester (Augustana).  184- Franco Santiago (Central Washington) vs. Mauricio Wright (San Francisco State). Jeff Henning (Central Oklahoma) vs. Tyler Jones (South Dakota State).  197- Brian Scislo (Findlay) vs. Muhammed Lawal (Central Oklahoma). Chad Wallace (Nebraska-Omaha) vs. Luke Goral (Wisconsin-Parkside).  HWT- Dupree Lacey (Central Washington) vs. Nick Severson (North Dakota State). Lyneil Mitchell (Gannon) vs. James Garvey (Augustana).