(Photo credit: Rick Scuteri-Imagn Images)

The Oklahoma City Thunder will be aiming for a third consecutive first-round playoff series sweep when they take the court Monday night in Phoenix.

The Suns have a different task -- avoiding being swept in the first round for the second consecutive postseason appearance.

One of the teams will get their way when the Thunder and Suns collide again in Game 4 of the best-of-seven Western Conference series.

Defending NBA champion Oklahoma City moved into position for another sweep with Saturday's 121-109 victory in Game 3 at Phoenix.

Reigning MVP Shai Gilgeous-Alexander poured in a career-playoff-high 42 points on stellar 15-of-18 shooting. He also made 11 of 12 free throws.

'I'm just not surprised anymore with him,' Thunder guard Alex Caruso said of Gilgeous-Alexander. 'I kind of have grown to expect it -- and that might be a detriment to him and his greatness, because I do get to see it every single night. But it really is magnificent to see just his mentality. He's eternally optimistic and he's just a killer with his competitive mindset.'

Gilgeous-Alexander is averaging 34.7 points and 8.0 assists in the series. He has scored 79 points in the last two games.

'I'm very fortunate to be in this position. But regardless of who's out there, I get to go out there and play my game,' Gilgeous-Alexander said. 'That's just the role I have on this team, and my coaches and teammates do a really good job of letting me be in my space.'

The Suns were incapable of slowing down Gilgeous-Alexander in Game 3 no matter what they tried to do defensively.

'Some of the shots were incredibly difficult,' Suns coach Jordan Ott said. 'We know he can make some of those shots.

'We tried different matchups, tried to take it out of his hands. He got to the area where it's a little harder to take it out of his hands when he just rises up over us. Give him credit. He had us spinning tonight.'

Phoenix is hoping to have guards Devin Booker (ankle) and Grayson Allen (hamstring) in good form for Game 4.

Booker left Game 3 for a time after injuring his left ankle in the third quarter. He finished with 16 points and seven assists.

Allen was back on the floor for the first time since April 10 and had seven points in 17 minutes. He made just 2 of 8 field-goal attempts and was clearly not 100%.

'I'm not worried about a percentage,' Allen said Sunday when asked to rate his health. 'I felt good enough to go and good enough to contribute so we gave it a shot.'

Dillon Brooks led Phoenix with 33 points in Game 3 and has 63 points over the past two games. He has made 12 of 28 3-point attempts in the series.

Booker's series high is 23 points and the Suns could use one of his vintage high-scoring efforts in the bid to stay alive.

Booker said it won't be easy to derail the Thunder.

'Overall, they're a well-oiled machine,' Booker said. 'They're champs for a reason. They know what they want to get every time down the floor and they definitely know what they're doing on defense. We have some growing and some learning to do in those departments.'

Phoenix will again be without big man Mark Williams (foot). Guard Jordan Goodwin (calf) is questionable.

Thunder star Jalen Williams (left hamstring) remains unlikely to return during this series, no matter how long it lasts. He was hurt in Game 2.

--Field Level Media