South Korean midfielder Park Ji-sung scored the opening goal to lift Manchester United to a 3-1 victory over Arsenal in the European Champions League semifinal match Tuesday.
The win sends United to the final in Rome on May 27, where it will face Barcelona or Chelsea.
Park scored in the eighth minute following a slip by defender Kieran Gibbs, who tried to intercept Ronaldo's cross, according to The Associated Press. Ronaldo made it 2-0 three minutes later with a swerving 35-yard free kick that beat goalkeeper Manuel Almunia.
The goal was Park's first in the Champions League for Manchester United. It was also his fourth goal this season and 12th since he became a member of Manchester United.
Ronaldo scored his second goal on a 61st-minute counterattack. He backheeled the clearance to Park, who sent the ball to Wayne Rooney, who then crossed to the FIFA player of the year.
Robin van Persie converted a penalty kick for Arsenal in the 76th minute after Darren Fletcher was ejected from pulling down Cesc Fabregas in the penalty area.
Chelsea, which lost last year's final to Manchester United on penalty kicks, hosts Barcelona Wednesday night following a 0-0 tie last week in the first leg in Spain. Manchester United is trying to become the first team to win consecutive titles since AC Milan in 1989 and 1990.