LAKE BUENA VISTA, Fla. (AP) — Diego Rossi scored on a penalty kick early in the first half and provided the clinching goal in the 82nd minute, and Los Angeles FC thumped the reigning MLS Cup champion Seattle Sounders 4-1. LAFC advanced to the quarterfinals of the MLS is Back tournament by getting a measure of revenge for last year’s Western Conference final when Seattle pulled off a 3-1 upset in Los Angeles on its way to winning the league title. LAFC also got goals from Latif Blessing and Brian Rodriguez. LAFC will face Orlando City in the quarterfinals.