The Phoenix Suns were left unimpressed by the physicality and officiating in their 118-103 loss to the New Orleans Pelicans that levelled the playoff series at 2-2 on Sunday.

The Pelicans repeatedly tested the Suns inside the paint in Game 4, with Brandon Ingram and Jonas Valanciunas combining to shoot half of New Orleans' 42 free throws.

By contrast, Monty Williams' Phoenix shot 15 from the line – in what was a 17-2 first-half difference between the sides – while being called for 12 more fouls than their opponents (28 versus 16).

The evergreen Chris Paul did not have one free-throw chance, after throwing 14 in the first three games, and went scoreless in the fourth quarter against defensive nuisance Jose Alvarado, who is a rookie guard.

The 36-year-old also managed just four points at the Smoothie King Center, a joint-low return in his playoff career alongside a four-point tally against the Denver Nuggets in April 2009.

Speaking to reporters after the game, Paul suggested the physicality was a throwback to yesteryear in basketball: "It's like the old NBA, isn't it?

"I asked one of the refs one time, 'Are we playing in the old NBA or the new NBA?'

"I was fortunate enough to play in both of them, we just have to figure out which one it's going to be. Regardless, whatever it is, you've to adjust early in the game and figure it out."

The Suns' coach Williams echoed Paul's frustrations as he bemoaned the officiating but acknowledged the eighth-seeded Pelicans were worthy winners in the Western Conference match-up.

"Forty-two to 15 in free throws – slice it any way you like to, in a playoff game that's physical, that's amazing," he said.

"Coaches shouldn't have to come up to the microphone and feel like they're going to get their head cut off for speaking the truth. It's not like we didn't attack the basket. That's really hard to do.

"They outplayed us and they deserved to win, but that's a free throw disparity."

The Pelicans attempted 46 shots in the paint to the Suns' 41, and New Orleans coach Willie Green was delighted with his team's aggressiveness.

"We were being aggressive. They dominated the paint last game," Green said. "Had 64 points in the paint. So we were well aware that we had to do better in that area."

Paul had 28 assists and zero turnovers in Games 2 and 3, but only produced 11 assists – four of those coming in the fourth quarter – and three turnovers in Game 4.

And Pelicans guard CJ McCollum was delighted with the defensive showing against the first-seeded Phoenix.

"I was tired of hearing about [Paul] breaking records during the fourth quarter," McCollum said of Paul.

"It's just a credit to our defense. Especially our intensity. But also, it's a make-or-miss league. He is not going to make every shot. But some nights, he is going to make a lot of tough ones.

"Tonight, he missed some shots he made the last three games. Credit our defense. But it's a make-or-miss league."

The Suns will also have to contain Ingram in Game 5 on Tuesday after he became the first Pelicans player in team history to score 30 or more in three consecutive playoff games.