In other games, the Philadelphia Union drew 2-2 at home to New York, Blas Perez scored twice to help FC Dallas beat the Vancouver Whitecaps 2-1 and Dwayne De Rosario scored in the 89th minute to lift Toronto FC to a 1-1 draw with the Chicago Fire.
Nguyen scored with a short chip shot in the 25th minute after Charlie Davies flicked a header forward off Jermane Jones' chip to set up Nguyen's 13th goal of the season.
Rowe leveled the score 2 minutes earlier from long distance after he blocked Wandrille Lefevre's clearance attempt with a nice first touch.
At Chester Pennsylvania, Sebastian Le Toux scored from a penalty in stoppage time to earn Philadelphia a share of the spoils with New York.
In the second minute of stoppage time, New York defender Ibrahim Sekagya was called for a questionable tackle in the box and Le Toux beat Luis Robles to complete the comeback for the hosts after trailing 2-0 in the first half after heavy rain and poor pitch conditions had delayed the start for an hour.
In the first half, Peguy Luyindula was pulled down in the box by Ethan White and converted the penalty kick in the 37th minute. Three minutes later, Thierry Henry got the ball from Chris Duvall at the top of the box and his shot squeezed past goalkeeper Zac MacMath.
Pedro Ribeiro scored for the Union to make it 2-1 at halftime.
In Bridgeview, Illinois, De Rosario 104th career goal was Toronto's first goal in three games. The striker tipped in the equalizer from close range after Gilberto knocked a header down in front of the goal. De Rosario's.
Lovel Palmer scored his first goal for Chicago with a header off Sanna Nyassi's short corner in the 11th minute.
At Fisco, Texas, Perez opened the scoring in the 20th minute from a nearly impossible angle, curling in a shot from just outside the corner arc that caught goalkeeper David Ousted off his line.
Erik Hurtado leveled it Vancouver in the 67th minute, before Perez scored the winner in the 78th minute when he pounced on a deflected free kick for Dallas.
Elsewhere, Gaston Fernandez scored in the 76th minute to lift the Portland Timbers to a 2-2 draw with the Colorado Rapids.
Also, Columbus Crew played out a 2-2 draw with Houston Dynamo.
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