Toronto FC visit the Columbus Crew for the first leg of the Eastern Conference final.
No one will need to tell TFC that this round of the MLS playoffs can produce a painful, agonizing 180 - or 210 - minutes of soccer, and often the team that emerges is the one that just keeps chipping away at it for longest.
Columbus and Toronto are both genuinely skilled, accomplished sides, with coaches who insist on passing out of defence and building attacks in a structured, intelligent way.
Greg Vanney and Gregg Berhalter will hope that the work they have done over the past nine months will pay off when it matters most, but they will also know that sheer force of will can be as valuable as anything at this time of year.