They felt as though things slipped away well before that.
Beal made a layup with 0.2 seconds left to finish with 29 points and give the Washington Wizards a 119-118 victory Friday night over Dallas, which has dropped three of five since Doncic went out with a sprained right ankle. The Mavericks committed 14 turnovers that turned into 23 Wizards points, and they weren't themselves defensively in part because Kristaps Porzingis got into foul trouble.
"The game was lost throughout," Mavericks coach Rick Carlisle said. "We had too many miscommunications, and it was a collection of defensive mistakes over 47 minutes and 58.2 seconds or whatever it was that led to this. Just very disappointing."
Beal's heroics came after Mavericks guard Tim Hardaway Jr. drew a blocking foul and hit one of two free throws with 1.8 seconds left.
"He was reading the defense really well and it's a great play, good screen, good finish," coach Scott Brooks said.
Beal fell one point short of reaching 30 for an eighth consecutive game, but felt great about getting the 18-32 Wizards to the edge of a playoff position in the Eastern Conference. They're three games back of the eighth seed.
"It just meant a lot to win at the end of the day," said Beal, who was 11 of 28 from the field. "We've got four or five home games before the break. We can take full advantage of that and be sitting right in the playoff picture."
Washington made 19 of 38 3-pointers. Davis Bertans was responsible for five of them and finished with 20 points.
"We've just got to do a better job guarding guys," Mavericks forward Dorian Finney-Smith said. "We've got to limit the wide-open 3s."
Rookie Rui Hachimura took it to Porzingis, getting the Mavericks center into foul trouble and finishing with 17. Porzingis, who played without a protective face mask two nights after breaking his nose, picked up his fifth early in the fourth quarter and had 11 points in just 21:16.
Shuffling Porzingis in and out didn't help the Mavericks' rhythm, especially on defense, where players blamed a lack of communication.
"This team is way too close to not talk as much as we did tonight," Jalen Brunson said. "We have very good chemistry, we all enjoy each other, so this is a very uncharacteristic night for us not talking defensively."
Doncic is progressing in his rehab, and the Mavericks hope he can play at least one game before the All-Star break, which begins for them after a game against Sacramento on Feb. 12. This is the second time Doncic sprained his right ankle this season, and it's unclear what kind of maintenance it'll need over the next few weeks and months.
"Any time you have any body part that's been injured a couple times, the training staff's going to watch it very closely," Carlisle said.
Unlike previous years, Dallas made no moves at Thursday's NBA trade deadline. That didn't surprise Carlisle.
"We like the roster," he said. "We've liked it from the beginning of the year. The important thing now is to work on our health going into the break."
The Wizards acquired 2018 first-round pick Jerome Robinson and fellow guard Shabazz Napier in a pair of deals in which they sent Isaiah Thomas to the Clippers and Jordan McRae to the Nuggets. Napier played against the Mavericks, while Robinson is expected to make his Washington debut Sunday.
"It was two great moves for us going forward," Brooks said. "They're both going to get good opportunities to see where they are as players and hopefully we can develop them as the rest of the season comes along."
Mavericks: Seth Curry returned after missing two games with left knee tightness and led Dallas with 20 points off the bench. ... G Jose Juan Berea missed a second consecutive game with a sprained left ankle. ... The Mavericks had seven players in double figures.
Wizards: Bertans passed Gilbert Arenas for the most 3-pointers in team history through the first 50 games of a season. ... Napier scored 14 points in his Wizards debut.
Mavericks: play perhaps their final game of this stretch without Doncic when they visit the Charlotte Hornets on Saturday.
Wizards: continue their lengthy home stand by hosting the Memphis Grizzlies on Sunday.
More AP NBA: https://apnews.com/NBA and https://twitter.com/AP-Sports
NBA Future Power Rankings: Full scores by category
How the rankings for all 30 NBA teams were put together by our experts.
NBA Future Power Rankings: Predicting best, worst franchises
We forecast the future for the NBA's 30 teams, from best to worst.
Is LeBron seeking attention watching his own highlights on IG Live?
Highly Quarantined discusses if LeBron James going over some of his best highlights is for the fans or for himself with the lack of attention he's gotten lately.