Caleb Folan and Omar Cummings keyed a rout of D.C. United last month.
Injuries will keep the forwards from doing it again, but the Colorado Rapids may have Conor Casey back.
With the injured list growing, Casey may be available as the reigning MLS Cup champions attempt their first season sweep of United on Saturday night at RFK Stadium.
Colorado (4-3-2) beat D.C. 4-1 on April 3, as Folan scored twice with Cummings adding another. The duo have combined for four goals and two assists on the season, and Cummings led the team with a career-high 14 goals last year.
The Rapids are 1-3-2 since that meeting with United (3-4-2), playing to a scoreless tie at New England last Saturday. Cummings sat out with an ankle injury, while Folan re-aggravated a groin injury and exited in the 30th minute.
Colorado learned this week it will be without the pair for at least two weeks.
"If we can just keep adding points to the board, we will be good," coach Gary Smith said. "Those bodies will be back and we'll be in a good position, and all the better for it."
Casey is nearing a return after being upgraded to probable with a left hamstring strain that has sidelined him since the last meeting with D.C. Having the forward back should soften the blow of playing without Cummings and Folan. However, Casey doesn't have a goal in three games this season after totaling 40 over the last three, the highest total of any MLS player in that stretch.
"Conor's moving along very nicely," Smith told the league's official website. "I hope we will see him in the 18 and I am positive he will be in contention for a place in the starting 11."
Casey hasn't scored in five games against D.C., managing to get just one of his 10 shots on net.
The Rapids won 1-0 in their last visit to the nation's capital on May 15, 2010, ending an 11-game winless run there (0-7-4) dating to a win on July 10, 1999. They're 3-10-4 all-time at RFK.
United is concluding a three-game homestand after playing to a scoreless tie with Dallas last Saturday following a 2-1 win over Seattle three days prior.
Charlie Davies, who missed the last meeting with Colorado due to a groin injury, is tied with Los Angeles' Landon Donovan for the MLS lead with six goals. The forward, though, came up empty on two shots against Dallas after scoring one and setting up Josh Wolff's tally against the Sounders.
Davies appears to be gaining momentum for inclusion on the U.S. roster for the upcoming CONCACAF Gold Cup. He hasn't played for the national team since a fatal car accident outside D.C. in 2009, and the injuries forced him to miss last summer's World Cup.
"From what we saw from preseason to where he is now, he's made up a lot of ground," Wolff told the team's official website. "For us, for US Soccer, it's an exciting thing. Hopefully he'll keep notching some goals and we'll keep moving up the table."
