Real Salt Lake have good quality at home this season, with 6 wins and 2 losses on home field so far.
As for Philadelphia Union, now they are the leaders in Eastern Conference. But their quality on away field is just mediocre this season.
Besides, now the AH line is -0.25 for the hosts, which is in favor of a home win.
So Real Salt Lake are expected to win this match as well as in AH payout.