Tavares beat all-tournament goalie Steve Cronin for the only goal in the ninth minute.
It was the fifth game in six nights for the team and fourth in four days. Brazil beat the United States, 2-1, on the opening day. The Americans, who led the tournament with 11 goals, recovered to win three straight games and advance to the final in what is considered the top summer under-20 tournament in the world.
Six Brazilians received yellow cards, bringing the total number of cards in the five U.S. games to 41 yellows and six reds.
''I thought we played well in the second half tonight, but you canÆt expect to beat Brazil if you only play one half,'' said U.S. coach Thomas Rongen. ''This tournament was a very positive experience for this team, and I think we learned a lot that will help us when the qualifying tournament comes around in November.''
Next up for the United States: qualifying for the 2003 World Youth Championship Nov. 13-17 in Charleston, S.C.
The Americans will hope to have back three players missing from the L'Alcudia tournament: D.C. United's Bobby Convey, the only U-20 with a cap on the senior national team; Santino Quaranta, who may return to action with United before the end of the season; and Frank Simek, the Arsenal youth player who missed the trip to Spain because of an injury.
U.S. UNDER-20 SUMMARY:
Aug. 29 in L'Alcudia
Brazil 1 USA 0. Goal: Tavares 9.
USA -- Cronin, Simo, Cochrane (Stone, 41), Marshall, Klaas, Mapp (Palomares, 76), Clark, Grabavoy (Cameron, 73), D.Johnson (Ambersley, 41), E.Johnson, Magee.
Brazil -- Diego, Marquinhos, Glauber, Vinicius, Edno, Wendel, Dudu, Marcelo (Bruno Moraes, 85+), Leandro (Ygor, 78 ), Caca, Tavares.