Sunday’s matchup between the Sparks and Phoenix Mercury felt like déjà vu. When the Sparks faced Phoenix last month, the game ended with a failed Sparks comeback.

In a twist of fate, Sunday’s comeback belonged to Phoenix.

Unable to stay ahead after building an 18-point lead, the Sparks fell 85-80 to the Mercury at Crypto.com Arena for their third consecutive loss.

As with the first meeting, the third quarter proved to be the Sparks’ undoing. After scoring just seven points in the third quarter of their loss to Phoenix on May 21, the Sparks were outscored 24-9 in the third Sunday.

“You’ve got to live with it,” Sparks coach Lynne Roberts said. “Sometimes we have a bad day. It’s a bad day to have a bad day. We have a lead like that, but that’s the game.”

Before the game, Roberts said consistency in transition defense, avoiding prolonged bad stretches and fluid ball movement would define a strong third quarter. None of that materialized against Phoenix (5-2).

But even more costly was their inability to score in the second half.

“This game came down to us not shooting,” Roberts said. “We had eight threes in the first half. We finished with eight. They had the same amount of field goals we did. They just hit four more threes.”

After opening with their best first quarter of the season, the Sparks became visibly frustrated in the second half. A three-pointer from Kathryn Westbeld with 2:11 left in the third gave the Mercury their first lead, 58-57, and capped a 21-5 run.

The shift in energy was palpable in what became a chippy, physical game. Momentum swung in Phoenix’s favor late in the third when Satou Sabally was fouled by Kelsey Plum while scoring on a layup, pointing and shouting to the Sparks bench as she celebrated.

Sabbaly exchanged words with the Sparks bench throughout the game, and drew a technical foul before halftime. After the game, she said her and-one celebration was aimed at her former assistant — now Sparks assistant coach — Zak Buncik.

“Well, he just motivated me a little bit. So, I was telling him, ‘Thanks,’” she said.

Sabally finished as the Mercury’s leading scorer with 24 points. She also had nine rebounds.

The teams traded leads early in the fourth quarter. Trailing by two, with 25 seconds left, Plum turned over the ball while trying to pass to an open shooter. Plum then fouled Kitija Laksa, who made two free throws to make it a four-point game.

Plum was one for 13 in the second half, finishing with 15 points and six rebounds.

“I just missed,” Plum said. “I had four really good looks that felt good coming out of my hands at the end of the game. I’m going to get another chance to do it, and I’ll hit them. But, I mean, I just didn’t feel like I had my legs.”

Playing seven games in 15 days, the loss capped off a grueling stretch — one that Roberts attributed to the team’s inconsistency as a result of lost practice time.

The Sparks (2-6) were a different team in the first quarter behind a new starting lineup of Julie Allemand, Dearica Hamby, Azurá Stevens, Odyssey Sims, Plum. With Allemand in the lineup, Sarah Ashlee Barker, who had started the previous five games, came off the bench.

The Sparks scored 27 points and had a 10-point lead going into the second quarter. After struggling with flat starts all season, the team finally found an early rhythm — one they’ve shown in flashes, but haven’t sustained.

Standing at 5-foot-8, Sims — one of the Sparks’ fiercest competitors — helped keep the team in the game, scoring a game-high 32 points.

She relentlessly attacked the basket, giving Mercury defender Sami Whitcomb the “too small’ gesture in the process. She hit the floor multiple times on hard drives, fighting through contact, and getting in the faces of Mercury defenders to confront them about foul calls. At times, the toll of her effort showed, as she walked with a slight limp between plays.

“It was a little bit more aggressive,” Sims said of her performance. “I think the run was kind of big for me today. I tried to stay in that mode. We were up going into halftime, and I just wanted to just basically keep my foot on their necks.”

Despite the effort, Sims says the team “let this one slip away.”

Plum praised Sims’ ability to respond to the Mercury’s runs almost single-handedly — she scored 15 of the Sparks’ 30 second-half points — but it wasn’t enough to secure a much-needed win for a Sparks team that plays eight of its next 11 games on the road.

“Of course, this one stings,” Sims said. “We know it’s the third quarter. We keep saying the same thing over and over, kind of beating a dead horse at this point, but it’s going to be less talking about it, and more doing it.”