Star left-back will miss four to six weeks.
Sarah Killion scored the first goal of the season for Sky Blue FC.
The Union have not won a game dating back to last August.
Sky Blue FC begin season in Seattle.
NYCFC travels down I95 to battle Philadelphia.
Head coach Patrick Vieira should change Pirlo's position.
Richie Marquez got his first goal of the season
NYCFC defense struggles in loss.
The Philadelphia Union haven’t won a game yet this season. Tonight may be their night against the Portland Timbers. It will...
Philadelphia's MLS club is winless through their first four games.