By Rex Gowar BUENOS AIRES, April 20 (Reuters) - River Plate lost two of their Colombian players through injury but were able to climb to the top of the standings with a 1-0 victory over Velez Sarsfield in an exciting Final Championship clash at the Monumental on Sunday. Striker Teo Gutierrez scored the only goal after half an hour but had to off with a leg injury early in the second half that sparked fears for his fitness with less than two months to go to the World Cup finals. It was tough but, thank God, the team managed to win," Gutierrez told Futbol Para Todos. Defensive rock Eder Balanta, whose form could earn him a place in Colombia coach Jose Pekerman's squad at the Brazil finals, also had to come off with a leg muscle injury after a knock 10 minutes from time. More...