The lead was nearly doubled shortly afterwards when the excellent Piscopo lashed a fierce half-volley against the post. At the other end, Sail – playing his first A-League game since April 2019 – got down smartly to deny Kwame Yeboah and produced an even better save to parry another goal-bound effort from the same player in the shadows of halftime.
As it happened: Phoenix and Wanderers share points
The visitors upped their energy levels in the second half and pushed hard for an equaliser, but Wellington held firm, soaking up pressure and creating the occasional opening themselves.
However, Sail was finally beaten with 20 minutes to go, Yeboah heading home from close-range after a well-worked Western Sydney free-kick. Waine had the ball in the net a short time later, but was denied by the assistant referee's flag, before Bruce Kamau met a perfectly weighted left-wing cross to put the Wanderers ahead.
But the Phoenix bounced back quickly, Alex Rufer heading a precise Clayton Lewis free-kick back across goal with Fenton rising highest to divert a clever header past Margush.
Both sides pushed hard for a winner, with the Phoenix having a confident penalty shout waved away, but eventually the points were shared.
Wellington face a quick turnaround, visiting bottom side Melbourne Victory on Wednesday night.
Wellington Phoenix 2 (Muratovic 9, Fenton 79)
Western Sydney Wanderers 2 (Yeboah 71, Kamau 76)