Will the 2nd leg of the Champions League Finals at Rio Tinto be the biggest MLS match ever?

So by virtue of their 2-2 draw at Monterrey on Wednesday night, Real Salt Lake has set up a very mouth watering match for themselves on the 27th at Rio Tinto Stadium in Sandy. The match is a sellout, with only a couple hundred tickets ever making their way to the general public (RSL season ticket holders bought out most of the stadium). RSL can win the Champions League trophy with a win, a 0-0 draw or a 1-1 draw. A 2-2 draw would push the match to extra time, and possibly PK's to determine the winner. A loss by RSL or draw of more than 2-2 would hand the title to Monterrey.

Of course RSL haven't given up more than 2 goals since their 37 match home unbeaten streak began, and only twice have they given up two goals (4-2 win over FC Dallas in 2009, and a 2-2 draw with Seattle in the home opener in 2010). In fact they allowed just 7 goals at Rio Tinto in MLS play last year, while they scored 31 goals while going undefeated in 2010 at home. In 2009 they were 9-1-5 at home with 34 goals scored and 11 allowed. Yes RSL is a dominant team at home.

So given all of this it raises a question, will this match be the biggest match in MLS history? Does it have a higher potential impact than the All Star matches with top European team? I have to say that I do think that there is an argument to be made that on April 27th at 8pm MT, that Real Salt Lake will take part in the biggest match ever for a MLS team and for the league. Vote to let me know your thoughts, if it isn't what match has been bigger?