Does this include post-extra time PKs? How the hell did Petke get a PK otherwise?
Yes. His came in the 2000 Open Cup shootout vs Columbus. It went 8 rounds. Petke went 8th and had the winner:
MetroStars - Valencia (goal); Crew - Warzycha (goal);
MetroStars - Walsh (goal); Crew - McBride (goal);
MetroStars - Chung (goal); Crew - Perez (goal);
MetroStars - Jolley (goal); Crew - Joseph (goal);
MetroStars - Ramos (saved); Crew - Farrell (saved);
MetroStars - Corrales (goal); Crew - Aguilera (goal);
MetroStars - Shak (goal); Crew - Yeagley (goal);
MetroStars - Petke (goal); Crew - Lapper (wide right).
Interestingly, the 3 players who did not kick were Tim Howard, Julian Gomez(!!!), and... Lothar.