A stunning goal by Chris Pontius provided United with a 1-0 lead in the sixth minute and though it pressed for additional goals, instead Toluca equalized with an Israel Lopez penalty kick in the second half to wrap up first place in the group with 13 points. United, which rebounded after losing its first two group matches, stands at 10 points and leads third-place Marathon by a point.
D.C. holds the head-to-head tiebreaker advantage and will advance at the expense of Marathon if the Honduran club doesn't beat pointless San Juan Jabloteh (0-0-5) in Trinidad Thursday.
Pontius scored a spectacular goal, his second of the competition, from well outside the penalty area to give United hope of an historic victory: no MLS team has won a competitive club match in Mexico. Luciano Emilio nodded a long Steve Cronin goal kick in Pontius' direction, and the rookie out of UC Santa Barbara controlled it with his chest and teed it up with a touch to belt a searing half-volley out of the air and into the top corner.
Cronin had already rescued United, by slapping away a dipping shot from Nestor Calderon. An offside decision in the 26th minute that looked dubious annulled a goal that Raul Nava put the ball in the net. Before halftime, Cronin also saved a low shot by Issac Brizuela and D.C. escaped again when Nava's header beat Cronin cleanly but came back off the crossbar.
Toluca, which needed only a point to advance, finally equalized in the 62nd minute. Lopez, just into the match as a substitute, faked Lawson Vaughn, who tripped him with a lurching tackle. Lopez easily smacked home the penalty to tie the game.
Dejan Jakovic and Christian Gomez came on for United, and Gomez got free for a header that nearly restored the lead but his shot flashed wide. Cronin stopped Nava in the late going to leave United's fate unresolved yet with a credible result on its ledger -- and some more momentum heading into its MLS regular-season finale Saturday at Kansas City.
Oct. 20 in Toluca
Toluca 1 D.C. United 1 Goals: Lopez (pen.) 62; Pontius (Emilio, Cronin) 6.
Toluca - Talavera, M. de la Torre, Gamboa (Esquivel, 57), Duenas, Almazan, Romagnoli, Marin (Lopez, 59). D. de la Torre, Calderon, Nava, Brizuela (Mancilla, 68).
D.C. United - Cronin, John, Vaughn, McTavish (Gomez, 68), James, Szetela, DiRaimondo (Jakovic, 63), Fred, Khumalo (Wallace, 46), Pontius, Emilio.
Referee: Geoffrey Hospedales.