The MLS play-offs really heat up here, with these two clubs now just three games away from glory.
FC Cincinnati are making their post-season debut this year, having claimed the unwanted wooden-spoon award in all three of their previous campaigns.
However, the Orange and Blue didn’t look out of place, coming from behind to beat New York Red Bulls 2-1 on Saturday.
Luciano Acosta equalising from the penalty spot in New Jersey, before Brandon Vazquez won it three minutes from time.
Now, can Pat Noonan’s side spring an even bigger surprise?
Philadelphia Union meantime enter at the Conference semi-finals stage, having finished first in the east this season.
The Union were beaten by NYCFC in last season’s Conference Finals, thereby missing out on a first MLS Cup appearance.
This season though, Jim Curtin’s men scored a ridiculous 72 regular season goals, netting 5+ on five occasions.
Philly were the only side not to suffer defeat at home all season, hoping to maintain that record here.
During the regular season, Cincinnati actually drew 1-1 in Pennsylvania, before winning 3-1 when these two clashed in Ohio.
Will Philadelphia Union march on at Subaru Park, will win the Orange and Blue leave Chester victorious?