Perry Kitchen broke a 4-4 tie in the 79th minute and DC United beat Real Salt Lake 6-4.
The 10 goals fell one short of the MLS single-game record.
Kitchen's header, off of a long service from Taylor Kemp, beat Jeff Attinella for the difference-maker. Nick Deleon's left-footed blast from way outside provided insurance six minutes later.
The teams combined for seven goals in the second half, one short of the record for most goals in a half.
Real Salt Lake jumped ahead 2-0 on goals by Joao Plata and...
LA Galaxy stars Steven Gerrard and Robbie Keane have been ruled out of the MLS All-Star Game on Wednesday with injuries, while United States captain Michael Bradley will also miss the match against Tottenham Hotspur.
Gerrard was named to the team alongside New York City FC's Frank Lampard despite them just joining their teams this month, but now neither of the former England stars will be able to play.
Keane made over 200 appearances for Tottenham in two stints from 2002-2008 and 2009-2011, and...