Defender Nat Borchers scored his first goal since returning to MLS this winter to give RSL a 1-0 lead early in the second half and Kyle Beckerman restored a one-goal edge after Gonzalo Belloso had equalized for Rosario Central, but Belloso scored again with eight minutes remaining to leave the teams level.
The match featured support for RSL, as about 60 LDS Church members, including some missionaries from the Salt Lake area, attended.
Scottish striker Kenny Deuchar, whose visa paperwork is still being processed, played the first half before being replaced by Yura Movsisyan, who set up Borchers for the first goal.
Colombian defender Jamison Olave, who had debuted for RSL last week in scrimmages against Newell's Old Boys, is being integrated into the lineup steadily. He played Sunday in a 3-0 victory over Jockey Club Rosario and also saw time in a 2-0 defeat of Central Cordoba Tuesday.
Olave replaced Matias Mantilla in central defense for the second half against Rosario Central. Former UCLA defender Tony Beltran, taken in the SuperDraft with the third overall pick, played the full 90 minutes at right back.
Midfielder Dema Kovalenko, acquired from Red Bull New York in a trade three weeks ago, didn't accompany the team to Argentina, nor did keeper Chris Seitz, midfielder/defender Nathan Sturgis, and forward Robbie Findley, who were named to the 20-man USA roster for the CONCACAF Olympic qualifying competition.
The team is scheduled to return to the United States Thursday, but Deuchar has headed back to Scotland to await issuance of his work visa, and Matias Cordoba and Mantilla have received permission to extend their visits to their homeland for a few days.
RSL will train at home before it plays Kansas City March 22 in Norman, Okla., which is its last preseason game against MLS opposition.