The defending champion Oklahoma City Thunder continued their undefeated run in the playoffs.

Ajay Mitchell finished with 20 points, and the top-seeded Thunder defeated the No. 4 Los Angeles Lakers 125-107 in Game 2 at Paycom Center on Thursday night to take a 2-0 lead in the Western Conference semifinal series.

The Thunder have won all six of their postseason games, four without All-Star Jalen Williams (hamstring). They haven’t needed him with the way Mitchell has played in Williams’ place in the starting lineup. Mitchell has averaged 18.7 points in the last four games.

The Lakers played without Luka Dončić, who is unlikely to play in the series because of a Grade 2 left hamstring injury he suffered on April 2 that will take eight weeks to recover.

Chet Holmgren had 22 points, nine rebounds, four steals and two blocks for the Thunder, while Shai Gilgeous-Alexander added 22 points.

After a LeBron James basket got the Lakers within 99-94 points with 7:36 left in the game, the Thunder went on a 12-1 run. Holmgren, Cason Wallace and Gilgeous-Alexander each hit a 3-pointer.

Austin Reaves, who led the Lakers with 31 points, went down hard with 10:34 left in the third quarter, 26 seconds after giving the Lakers a 63-61 lead. He got tied up while defending Gilgeous-Alexander, who was called for a flagrant 1 foul, his fourth foul of the game. Alex Caruso also got a technical, and Reaves stayed in, making the technical free throw and both flagrant free throws to put the Lakers up five, their biggest advantage.

But the Thunder closed out the third quarter on a 23-9 run and took a 93-80 lead into the final 12 minutes. During the spurt, Jaylin Williams had a 4-point play and Jared McCain (18 points) hit two 3s.

James had 23 points for the Lakers, who will host Game 3 on Saturday. Rui Hachimura had 16 points.

Here are our Game 2 takeaways from Oklahoma City: 

Shai Gilgeous-Alexander who?

Game 2 of this series, while wrapped in part by SGA, was won by virtually everyone else. After the superstar picked up his fourth foul with 10:34 remaining in the third, Thunder coach Mark Daigneault had little choice but to sit him. He ended up doing so for the remainder of the quarter, mostly because the non-Shai minutes were just too good.

The Thunder followed with a 25-8 run, getting a little bit of everything from everyone. Ajay Mitchell did an SGA impression, ruthlessly attacking the rim and attempting six free throws in the quarter. Alex Caruso was as disruptive as ever. Jared McCain drilled a pair of 3s and swooned the crowd. What once was a back-and-forth of lead changes turned into OKC’s largest lead of the night.

And on this rare occasion, Gilgeous-Alexander played no part.

Austin Reaves responds

For all the talk about Austin Reaves not being ready for the moment, the Lakers guard had the highest-scoring playoff game of his career. His 31 points provided the offensive punch the Lakers didn’t have in Game 1. The defense, though, wasn’t nearly as effective. For the second-straight game, the Lakers’ plan for containing Shai Gilgeous-Alexander largely worked. The cost of that strategy, though, was open shooters and offensive rebounding opportunities, and the Thunder made them pay. As the series shifts back to Los Angeles, the Lakers will need more performances like this from Reaves. In Game 2, he showed he’s capable of delivering one.