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Forlan will team up with current world No. 101 Federico Coria of Argentina in the main draw at the clay court Challenger Tour event in Montevideo after being given a wild card.
PSG will face Borussia Dortmund in the semifinals after the Germans beat Atletico Madrid.
PSG came into the match unbeaten in their last 27 games in all competitions but were undone by a fired-up Barcelona side looking to return the club to the summit of European football.
Atletico Madrid needed a penalty shootout to edge past Inter Milan and reach the Champions league quarterfinals
Victory means Real return to the top of the LaLiga table on 18 points from six games, two ahead of Barcelona in second.
Tensions boiled over in the closing stages and Atletico defender Felipe was sent off after receiving a second yellow card before the teams played out 12 minutes of added time.
United are left to focus on a Premier League campaign where they face a real battle to make the top four and earn a place in next year's Champions League.
Atletico had many opportunities to extend their lead and hit the post twice but were punished by a defensive mistake which gifted the ball to Bruno Fernandes 10 minutes from time.
Atletico won 3-1 at Porto in a tense, ill-tempered game as both sides finished with 10 men.
With four wins out of four, Juergen Klopp's side can now take their foot off the gas for the final two games of the group stage.
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