LOS ANGELES (AFP) — The Oklahoma City Thunder, fueled by 38 points from Shai Gilgeous-Alexander, held off the Memphis Grizzlies, 117-115, to complete a 4-0 sweep in their National Basketball Association (NBA) Western Conference playoff series and become the first team to reach the second round.

The Cleveland Cavaliers were on the brink of advancing, taking a 3-0 stranglehold on their Eastern Conference series with a 124-87 blowout of the Miami Heat.

And the Denver Nuggets leveled their Western Conference series with a stunning 101-99 victory over the Los Angeles Clippers sealed by Aaron Gordon’s put-back dunk at the final buzzer.

Jalen Williams added 23 points for the Thunder, who were pushed to the wire in Memphis despite the absence of Grizzlies star Ja Morant, who was ruled out with a hip contusion suffered in game three.

Scotty Pippen Jr. scored 30 points and Santi Aldama and Desmond Bane had 23 points each for the Grizzlies, who trailed by 12 with 3:37 to play but closed within two in the waning seconds only to come up short.

After the first three games featured a total of four lead changes, the teams traded the lead 15 times in the first three quarters.

Oklahoma City took the first double-digit lead of the game with less than six minutes remaining and, without Morant, Memphis just didn’t have enough to extend the best-of-seven series.

Gilgeous-Alexander had struggled offensively by his standards in the first three games of the series.

But he looked like the player who won the regular-season scoring title as he connected on 13 of 24 shots from the field, setting an early tone with 16 points in the first quarter.

“I didn’t think he played any different,” Thunder coach Mark Daigneault said.

“I just think he got into a groove.”

The Thunder, who led the league with 68 regular-season wins, next face either the Denver Nuggets or Los Angeles Clippers, who were tied at 2-2 after the Nuggets’ sensational victory in Los Angeles.

Three-time NBA Most Valuable Player Nikola Jokic scored 36 points with 21 rebounds and eight assists for the Nuggets, who led by 22 early in the fourth quarter.

The Clippers, led by 24 points from Kawhi Leonard and 22 from Norman Powell, surged back to take their first lead of the game, 97-96, on Bogdan Bogdanovic’s reverse layup with 1:11 to play.