The 10-man Earthquakes held on for a 3-2 win over Los Angeles FC.
Latif Blessing tapped in the opener for LAFC midway through the first half, but an Eduard Atuesta own goal from a corner brought San Jose level.
Chris Wondolowski's side-footed finish from a Cristian Espinoza cross put the Earthquakes ahead eight minutes before half-time.
However, San Jose's chances took a hit when Jackson Yueill was sent off for a rash challenge in the 61st minute.
But Espinoza delivered an excellent finish to make it 3-1 and the Earthquakes held on despite Diego Rossi's late goal.
San Jose has earned 14 points from losing positions this season, including four come-from-behind wins, and both are the most in MLS in 2020.
Kellyn Acosta's 83rd-minute winner saw the Rapids edge the Portland Timbers 1-0 to reach the play-offs.
Acosta produced a fine finish into the top corner from inside the area after a pass from Diego Rubio to secure three points for Colorado.
It was just the Rapids' second MLS victory at Portland, ending a nine-match winless run dating back to 2011, according to Opta.
Colorado moved into the MLS play-offs for the first time since 2016.
Nani was sent off as Orlando City recorded a 2-1 victory over the Columbus Crew.
Chris Mueller had put Orlando ahead before Nani was harshly sent off for a sliding challenge.
Harrison Afful equalised for Columbus, but the 10-man Orlando found an 84th-minute winner through Benji Michel.
Orlando has won four straight matches against Columbus, the first time it has managed that against a single team in its MLS history.
Javier Hernandez scored but LA Galaxy was held to a 1-1 draw by the Seattle Sounders.
Hernandez's goal saw him end a 433-minute scoring drought dating back to July.
Elsewhere, Dallas beat Nashville 1-0 and Minnesota United and the Chicago Fire drew 2-2.