SANDY, Utah — RSL looked nothing like a team that hadn’t won in more than a month. With Will Johnson, Kyle Beckerman, and Javier Morales all back in the starting lineup, the Claret-and-Cobalt controlled the tempo from the outset en route to a dominating 3-0 victory over the Seattle Sounders in the first leg of their Western Conference semifinal matchup at Rio Tinto Stadium on Saturday night. Álvaro Saborío scored two goals and Ned Grabavoy added the third as RSL took a commanding lead heading into the return match on Wednesday night at Seattle’s CenturyLink Field (10 pm ET; ESPN2, ESPN Deportes, ESPN3.com; live chat on MLSsoccer.com). Seattle will need to regroup after managing no shots on goal against a masterful Real Salt Lake defense. Kasey Keller kept the series from getting out of hand with eight saves. Morales contributed two assists for the home side. RSL started off strongly, with Fabián Espíndola among the standout performers in the first stanza. His strike partner Saborío just missed scoring in the eighth minute, while Keller had to dive to deny Will Johnson in the 20th. Keller once again came up big in the 24th minute, stretching to his left to deny Andy Williams when it looked like the RSL midfielder would score. Kreis was forced to use a substitute in the 31st minute, bringing on Chris Schuler for Jámison Olave (right quad strain). The move didn’t slow RSL’s tempo, as the team finally broke through in the 41st. Saborío provided the final touch to a lovely maneuver as Javier Morales and Chris Wingert advanced down RSL’s left side against Seattle's James Riley. The overlapping Wingert’s cross was headed for the net, but Saborío tapped it in on the goal line. After conferring with the assistant referee about a possible offside call against Saborío, match referee Mark Geiger ruled it a good goal.