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...
David Villa scored two goals to help New York City FC overcome a hat trick by Cyle Larin and beat Orlando City 5-3 on Sunday.
Villa's second goal, his 12th of the season, broke a 2-2 tie in the 67th minute, Thomas MacNamara added another in the 71st and NYCFC led the rest of the way.
Larin's final goal pulled Orlando City (6-9-6) within 4-3 in the 85th, but after Kaka hit the post on a free kick that would have tied it in stoppage time, Mix Diskerud broke out and capped the scoring seconds later.