This feels familiar. A sprained ankle to a key player in March. A shadow of uncertainty as the Phoenix Suns approach a key stretch of their season.

Devin Booker didn’t play in Sunday’s 118-110 home loss to the Oklahoma City Thunder. The All-Star guard sprained his right ankle in Saturday’s loss to the Houston Rockets. The Suns have not commented publicly on the injury’s severity other than to say initial X-rays were negative. Coach Frank Vogel said before Sunday’s game that Booker still was getting evaluated. He planned to have an update Tuesday.

On its own, this is not a huge deal. Ankles get turned and twisted on every basketball court, playground or professional. It just stings a little more in this market. Nearly a year ago to the day, Kevin Durant, warming up before his first home game after getting traded to Phoenix from Brooklyn, sprained an ankle. He missed three weeks, robbing the Suns of time needed to build chemistry. They lost in the Western Conference semifinals.

Booker’s situation is different because, unlike Durant, he’s been here awhile. It’s not like he’s finding his way with a new team. But this is also worse for the simple reason Phoenix cannot survive for long without Booker. He’s too important as a playmaker, a fact underscored by the Suns’ topsy-turvy performance against the Thunder.

Big man Jusuf Nurkic grabbed a franchise-record 31 rebounds — the most by an NBA player in a game this season, an effort Vogel called incredible.

Jusuf Nurkic set a franchise record with 31 rebounds Sunday. (Mark J. Rebilas / USA Today)

Bradley Beal scored 31 points and the Suns rallied from a 24-point deficit, taking a 6-point lead early in the fourth quarter. But the Thunder (42-18) settled, later pulling away with a 10-0 spurt.

“That s— dwindled quick,” Beal said of the Phoenix lead.

The Suns (35-26) sit in seventh place in the Western Conference, but they are 2-4 since the All-Star break with two puzzling losses to the Rockets. Making matters potentially worse is the remaining schedule. It’s brutal. Starting with Tuesday’s game at Denver, the Suns have 21 remaining contests. Fifteen are against teams that entered Monday seeded fifth or better in their respective conferences. The Suns face Boston twice. Denver twice. The Clippers twice. Minnesota twice. And Cleveland twice.

This would be a tough task at full strength. Being without Booker for a week or two — if that ends up being the case — would make it more difficult. The Suns are 4-7 this season without Booker, who averages 27.5 points and 6.8 assists.

Sunday’s loss left Phoenix fuming. The frustration was clear. Vogel was mad at the officiating.

“They fouled the s— out of Kevin Durant all night,” he said. “Whether he has the ball and he’s getting stripped three or four, maybe five times. And then every time he tries to get open, he’s being held, which is something I really want the league to look at.”

Said Durant in the locker room: “I’m not talking about that.”

The bigger issue was Phoenix’s turnovers, which is nothing new. Entering Sunday, the Suns averaged 14.1 per game, which ranked 25th in the league, the worst among playoff contenders. Against Oklahoma City, they committed 22 that led to 31 Thunder points. Some of this had to do with Oklahoma City’s defense — the Thunder lead the NBA in forcing turnovers — but a lot of it stemmed from Phoenix’s sloppiness.

Durant threw an inbounds pass that was intercepted. Nurkic hurled a ball into the crowd. Beal lost control. After four turnovers in five possessions in the first half, Vogel called time and the Suns walked to the bench as many in the home crowd booed.

“I think we all agree in the locker room that this s— has got to change,” Nurkic said.

Asked how the Suns can fix their turnover problems, Beal said simply: “Shoot the ball.”

In other words, stop overpassing.

“We tried to make the risky plays sometimes, crosscourt passes,” said Durant, who had 20 points. “They get their hands on it. There’s going to be a lot of pressure on us at all times. … We got to be better.”

A good sign for the Suns: They rallied. With eight minutes left in the third quarter, Shai Gilgeous-Alexander sank a short jumper to give Oklahoma City an 80-56 lead. The Suns looked dead. Then the game turned. Durant made a 3. Grayson Allen made a 3. Beal scored from inside. By the time Eric Gordon splashed a 3 a minute into the fourth quarter, the Suns had gone on a wild 35-9 spurt and led 91-89.

It was amazing: For a stretch in the first half, the Suns had played some of their worst basketball. Yet, in that second-half stretch, they played some of their best. In many ways, it mirrored their season. Every time this team seems to find a rhythm, the big three of Booker, Durant and Beal forming a dangerous core, the Suns stumble. Or someone gets hurt. One week Phoenix looks like a Western Conference contender. The next it looks like a potential first-round flameout.

Fans need consistency. Or maybe a therapist.

There’s still time.

“Yes and no,” Beal said. “We got time, but we can’t keep saying we got time. We only got (21) games left. It’s a good amount of games to really get us going and get us going right before the playoffs. I think that will be really good for us, but we do got to get rolling. We can’t keep talking about it. We’ve got to do it. We got to hit this steamroller head-on.