Denis Bouanga had two goals and an assist on Sunday night to help LAFC beat Austin FC 4-1 and sweep the best-of-three series in the first round of the MLS Cup playoffs.

LAFC, which won Game 1 2-1, plays at second-seeded Vancouver in the one-game Western Conference semifinals.

Son Heung-Min added a goal and an assist for No. 3 seed LAFC. Jeremy Ebobisse replaced Son in the 88th minute and capped the scoring in the third minute of stoppage time.

Son, on the counter-attack, hesitated to freeze defender Ilie Sánchez at the top of the area and then exploded toward the left end line and blasted a shot from the corner of the 6-yard box inside the back post to open the scoring in the 21st. About four minutes later, Son fed Bouanga for a finish - the 30-year-old's 100th goal across all competitions for LAFC -- into a wide-open net to make it 2-0.

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Bouanga cut inside to evade defender Brendan Hines-Ike -- who fell to the ground -- and then flicked a shot into the net from the left center of the area in the 44th minute.

Bouanga is the only active player -- and is one of just nine in history -- with at least 10 career goals in the MLS Cup playoffs.

LAFC's Hugo Lloris -- who was second in MLS with 12 shutouts in the regular season -- had three saves, including a diving stop on a penalty kick by Myrto Uzuni in the 39th minute after a hand ball in the area by Bouanga.

Ryan Porteous was shown a yellow card for a foul in the area and Dani Pereira converted from the spot in the sixth minute of stoppage time to make it 3-1 at halftime.

CJ Fodrey appeared to have cut sixth-seeded Austin's deficit to 3-2 in the 71st minute but an offsides call nullified the would-be goal.