The 17th ranked Iowa State Cyclones kept a hold on a share of first place in the Big Twelve Conference with a 72-62 win at Missouri last night.There was confusion at the end of the first half as Missouri hit a shot and Cyclone Coach Larry Eustachy tried to argue that it shouldn’t count. Security personel restrained Eustachy. After the game he was asked if he accused them of assault. Eustachy denied anyone assaulted him and said he was just frustrated. Eustachy got a technical and Missouri shot free throws at the start of the second half to build a five-point lead. Eustachy says he was disappointed his actions put the team in a hole.Marcus Fizer tied a season high with 28 points and pulled down 12 rebounds. Eustachy says it was their plan to get Fizer the ball.Jamaal Tinsley scored 15 and Stevie Johnson added 10 points. The win ups the Cyclones’ record to 20-3 on the season — the ninth ISU team to win 20 — but the first to due so in February. The Cyclones swept the season series with the win against the Tigers and upped their conference record to 8-1. They’re tied for first place with Oklahoma State. Iowa State is now 3-1 on the road in conference play after going 1-15 the previous two seasons. ISU is back home Saturday to host Nebraska in Hilton Coliseum.