Mohegan — Connecticut Sun head coach Curt Miller wasn’t sure how he was going to go about handling Friday night’s game against the Chicago Sky.

On one hand, Connecticut could ease up a little bit. It was already guaranteed a top-two seed in the WNBA playoffs and a double-bye to the semifinals — as well the precious rest that comes with it.

On the other hand, to heck with all that — the Sun want to win them all.

They almost pulled it off. Courtney Williams was fouled on a 3-point attempt with 1.3 seconds left in regulation and made all three shots to force overtime.

The Sky, however, pulled away in overtime for a 109-104 win before 8,077 at Mohegan Sun Arena.

“We don’t like losing, regardless of us (already) solidifying (a top-two seed),” Williams said. “We don’t like to lose. Especially at home … It was important for us to do it in front of our fans.”

Jonquel Jones said, “We wanted to go gung-ho.”

The loss locked up the No. 2 seed for Connecticut (23-10) in the playoffs. It will play its regular-season finale on Sunday at the Indiana Fever, then rest and prepare for the best-of-five semifinals against the highest remaining seed.

Game 1 is Tuesday, Sept. 17.

The Washington Mystics (25-8) will be the top seed.

It was just the Sun’s second home loss as they finished a league-best 15-2 and tied the franchise record set in 2011.

The Sky (20-13), the Los Angeles Sparks and Minnesota Lynx are the only teams Connecticut didn’t beat in a regular-season series.

Chicago is tied for fourth place with the Las Vegas Aces with each having a game left. The Sky play at Washington on Sunday, while Las Vegas hosts the Phoenix Mercury (15-17).

The Aces hold the head-to-head tiebreaker.

Chicago rallied to win Friday night after after trailing 85-75 with 7 minutes, 1 second left in regulation.

Diamond DeShields, one of the Sky’s three All-Stars, scored a game-high 30 points with seven rebounds. Her 21-foot jumper put Chicago ahead to for good, 99-98, with 2:59 remaining in overtime.

Courtney Vandersloot had 19 points and 11 assists for Chicago and Astou Ndour scored 18. Former UConn standout Gabby Williams also scored seven of her nine points starting in the fourth quarter and finished with seven rebounds.

The Sky shot 53.2 percent (41 of 77).

Williams had 25 points, nine rebounds, nine assists and four steals for Connecticut and Jones had 18 points and nine rebounds.

Jasmine Thomas had 13 points, six rebounds and three assists, Shekinna Stricklen scored 14, and reserve Bria Holmes scored 11.

It was one of the wildest games all season for Connecticut with 23 lead changes and 13 ties. It began with a first quarter straight out of Paul Westhead’s happiest dreams as it was the highest scoring quarter of the season for the Sun.

Gabby Williams ended the quarter with a putback to give Chicago a 34-33 lead at the buzzer. It was the first time this season that the Sun or their opponent scored over 30 in the first quarter.

The game was tied at 52 at halftime.

“Both teams like tempo,” Miller said. “Both teams want to play that way. Both teams are really efficient in transition. Both teams were screening so well in the first half. It wasn’t bad defense. It was just better offense by both of us.

“There’s that tug-and-pull that they’re probably wondering at times; if it would be better if the game slows down. And we think at times if it would be better if we let a little bit of air out of the ball, slow down their tempo. But we both enjoying playing (fast).”

It looked like Chicago was going to win after Jasmine Thomas missed a 26-foot shot with 6 seconds left in regulation.

Williams, all 5-foot-7 of her, somehow got the offensive rebound and was fouled while attempting a 3-pointer with 1.3 seconds left.

Williams made all three to tie it. Chicago missed its final shot after an inbounds play.

“My heart was about to jump out of my chest,” the normally confident Williams admitted. “I (was) about to pee on myself. That’s exactly how I felt. I was nervous, but I just shot them like I always do.

“I knew once I hit the first one — it was a little shaky — but I knew once I hit that one that I was going to be good.”

Connecticut had a shot to tie it again in overtime after Stricklen’s 3-pointer cut the deficit to 107-104 with 36.5 seconds left, followed by the Sky missing a shot on their next possession.

Stricklen got the rebound with 12.4 seconds remaining and Miller called timeout.

Stricklen missed a 3-pointer with 7.3 seconds left. DeShields got the rebound, was fouled, and made both free throws.

“Well that was fun,” Miller said. “That’s playoff basketball. Two high-level teams playing (hard) down the stretch. Disappointed that we couldn’t hold that fourth-quarter lead, but we made some big plays to get it to overtime, made some big plays to stay in that game even late.

“I’m proud of our grittiness. Proud of what we did at home this year.”

• Chicago surprised Jones before the game with a video announcing it would be donating to her GoFundMe for hurricane relief in her native Bahamas, followed by presenting her a check for $5,100.

“When we line up for the National Anthem, I’m already in game mode,” Jones said. “To see (that gesture), I just kind of broke down a little bit.

“For them to be so generous as they were, to give (me) that check and everybody coming together to do what they did, it just shows the type of organization and franchise that they have and the people that are there. I’m humbled.”

As of 11:30 p.m. Friday, 229 donors had contributed $37,913 towards Jones’ goal of $50,000.

Jones said she had talked to her parents and that they were safe. As of Wednesday, she hadn’t heard from them in three days.

n.griffen@theday.com