SANDY -- Real Salt Lake was pressing for the go-ahead goal four minutes into stoppage when FC Dallas led a 3-2 counter that ended with midfielder David Ferreira scorching Nick Rimando to the top right corner.
"A tie is not good enough for us at home," coach Jason Kreis said. "We were going after the win."
The 2-1 loss maintains the Claret-and-Cobalt's skid (now at four games) and reinforced rumblings the team is slipping in the Western Conference.
"I think we're in a very precarious position right now," Kreis said. "We put a ton of emphasis on this game and I was very emotional with my team yesterday and said 'enough is enough.' "
Ferreira logged an assist and the game winning goal as FC Dallas escaped Rio Tinto with their third straight win.
Tempers flared early in the first half and RSL's Tony Beltran, Kwame Watson-Siriboe and Fabian Espindola all netted yellow cards.
RSL ended the game with 15 attempts-on-goal to Dallas' seven and paced FC on corners 10-2.
Kyle Beckerman, Will Johnson and Alvaro Saborio all went 90 minutes with their respective national teams earlier in the week and the trio didn't see any time during the first 45 minutes although Saborio replaced Espindola for the start of the second half.
Goalkeeper Nick Rimando was also in Mexico on U.S. men's national team duty Wednesday, but didn't play in the match and logged three saves as he got the start on Saturday.
Down 1-0 in the 75th minute Beckerman made his game debut to 20,000 roaring Real faithful. 30 seconds later Saborio got his head on a ball from Javier Morales in traffic and lofted it over Dallas goalkeeper Kevin Hartman for the equalizer.
"The one thing we hopefully gained from tonight was some rest for a couple of our players," Kreis said.
Despite giving up the goal and a rough collision in the game's waning minutes, Hartman proved the difference for Dallas facing 15 shots and logging four big saves.
RSL (13-10-3) hosts Panamanian club FC Tauro in CONCACAF Champions League Group Stage on Tuesday before traveling to Philadelphia for a league game against the Union on Friday.
Ferreira's stoppage time winner gives FC Dallas a bit of revenge on RSL, which got a stoppage time winner of its own from DF Nat Borchers in the RSL's 3-2 home win over Dallas on May 26.
Salt Lake City native Justin Braun made his home debut for RSL on Saturday night, coming on in the 67th minute for FW Paulo Jr. Braun, who was acquired on July 11 in a trade with Montreal, had one previous RSL appearance (Aug. 4 at Colorado).
* SPORTING KC 1, TORONTO FC 0: At Toronto, Kei Kamara scored on a free kick in the 83rd minute to lift Sporting Kansas City to a 1-0 victory over Toronto FC on Saturday.
Kamara's kick went off Toronto goalkeeper Milos Kocic's finger tips and into the bottom right corner of the net as Kansas City (14-7-4) won its third straight MLS contest.
Toronto (5-14-5) remained last in the Eastern Conference and extended its unbeaten streak to four matches.
* SOUNDERS FC 2, WHITECAPS 0: At Seattle, Fredy Montero score in the 64th minute, Eddie Johnson added a clinching goal in the 87th minute and Seattle beat Vancouver in a key game for positioning in the MLS Western Conference playoff chase.
Just two minutes after coming off the bench, Montero got his eighth MLS goal of the season. Mauro Rosales took a free kick from about 35 yards out, but instead of going on net, chipped it into the penalty area. Defender Jeff Parke played the ball off his chest and directed it to Montero, who got just enough of his toe on the shot to bounce it past Vancouver goalkeeper Joe Cannon.
Johnson scored on a counter attack off a cross from Brad Evans in the closing minutes for his 11th goal of the season.
* IMPACT 3, EARTHQUAKES 1: At Montreal, Lamar Neagle and Patrice Bernier scored in the second half to help Montreal beat league-best San Jose for the Impact's fourth straight victory.
Neagle got his second goal of the season to put Montreal (11-13-3) ahead 2-1 in the 61st minute. Both teams played most of the game with 10 aside, while San Jose ended with just nine men.
Bernier, who set up Neagle's score, got his team-leading seventh goal on a penalty kick in the 73rd minute. Marco Di Vaio scored for Montreal in the first half.
Earthquakes captain Chris Wondolowski scored his league-leading 18th goal on a penalty kick in the 23rd minute to give the Earthquakes (14-6-5) a 1-0 lead
* FIRE 2, REVOLUTION 1: At Bridgeview, Ill., Sherjill MacDonald's first MLS goal broke a tie just past midway through the first half and Chicago held on to beat New England.
Chris Rolfe also scored to help the Fire (12-7-5) win their third straight and move into a tie with New York for second place in the Eastern Conference, five points behind Kansas City.
Fernando Cardenas scored for New England (6-13-5), which dropped to 0-6-1 in its last seven matches. The Revolution also lost by one goal for the 12th time this season.
* CHIVAS USA 1, RAPIDS 1: At Commerce City, Colo., Juan Pablo Angel scored in the 83rd minute to rally Chivas USA to a tie with Colorado.
Tristan Bowen took possession of the ball along the sideline and found Angel alone behind the Colorado defense. Angel easily beat Matt Pickens, denying the Colorad goalkeeper his seventh shutout of the season. Pickens is the franchise's all-time leader in shutouts (28) and wins (40).
Chivas USA (7-9-6) had only two shots on goal the entire game, both late in the game. The Goats have scored only 15 goals all season.
Brian Mullan scored in the 19th minute for Colorado (8-15-2), which has not lost in its last seven meetings (5-0-2) against Chivas USA.