The victory, on the six-team, seven-game ChampionsWorld Series exhibition tour, was the second of Manchester United's four-game U.S. tour. United topped Glasgow Celtic, 4-0, in its opener Tuesday in Seattle, and plays Italian champion Juventus on Thursday in East Rutherford, N.J., and Spanish giant Barcelona next Sunday in Philadelphia.
Barcelona topped Juventus on penalty kicks following a 2-2 tie in another ChampionsWorld Series match Sunday, played before 30,912 at Gillette Stadium in Foxboro, Mass.
In L.A., Van Nistelrooy broke a scoreless tie two minutes into the second half, taking a Forlan flick-on past two defenders and firing to the upper-left from about 16 yards.
Forlan scored his first two minutes later, a header from Quinton Fortune's cross from the left, and added another with a first-time blast from an Ole Gunnar Solskjaer flick.
Christian Patino scored for America in the 87th minute. Alvaro Ortiz also found the net for the Mexicans, a 54th-minute free kick from 25 yards that referee Ali Saheli waved off because an America player made contact with a player in Manchester United's wall.
Argentine striker Javier Saviola scored in the 28th and 41st minutes for Barcelona. Juventus forced penalties with two late goals, by Marco De Vaio in the 86th minute and Fabrizio Miccoli in the 87th.
July 27 at Los Angeles
Manchester United (England) 3 America (Mexico) 1. Goals: van Nistelrooy 47, Forlan 49, 79; Patino 87.
Manchester United -- Ricardo; P. Neville (Lynch, 53), Ferdinand, O'Shea, Fortune (Fletcher, 53); Bellion (Giggs, 53), Butt, Veron, Richardson (Pugh, 52); van Nistelrooy (Solskjaer, 74), Forlan.
America -- Rios; Castro, Ortiz, Rojas, Salinas; Villa; Torres (Infante, 46; Fernandez, 85), Abreu (Castillo, 46), Oviedo; C. Blanco (S. Blanco, 46), Mendoza (Patino, 46).
Yellow cards -- Manchester United: van Nistelrooy 40, Pugh 70; America: Mendoza 39, Villa 88.
Referee -- Ali Saheli (U.S.)
A -- 57,365.
July 22 at
Manchester United (England) 4 (van Nistelrooy 7, Giggs 28, Solskjaer 39, Bellion 72) Celtic (Scotland) 0.
July 25 at Cleveland
Celtic (Scotland) 1 (Sutton 59) Boca Juniors (Argentina) 0.
July 27 at Foxboro, Mass.
Barcelona (Spain) 2 (Saviola 28, 41) Juventus (Italy) 2 (De Vaio 86, Miccoli 87).
(Barcelona wins on penalties.)
July 27 at Los Angeles
Manchester United (England) 3 (van Nistelrooy 47, Forlan 49, 79) America 1 (Patino 87).
July 30: Barcelona (Spain) vs. AC Milan (Italy) at RFK Stadium, Washington, 8 p.m. ET.
July 31: Manchester United (England) vs. Juventus (Italy) at Giants Stadium, East Rutherford, N.J., 8 p.m. ET.
Aug. 3: Manchester United (England) vs. Barcelona (Spain) at Lincoln Financial Field, Philadelphia, 8 p.m. ET.