RIO DE JANEIRO (AP) — Written in Portuguese on one wall above center court at Carioca Arena is the phrase “Um mundo novo.” Translation: A new world.

It didn’t seem that way in men’s Olympic basketball — until now.

Threatened by Australia in its previous game, the U.S. men’s team survived a heart-racing final seconds to defeat disciplined and experienced Serbia 94-91 on Friday night and extend its winning streak in international tournaments to 49 games.

No. 50 is no given, and suddenly, a gold medal that seemed a formality just a few days ago is anything but certain.

The Americans, boasting a roster stuffed with NBA All-Stars, elite outside shooters but only two former Olympians, look very vulnerable and somewhat lost on the world’s hardwood stage.

“We do have more talent,” said U.S. coach Mike Krzyzewski, who has been warning about overconfidence since his team’s arrival in Brazil. “We have to get our talent playing even much better as a team.”

Despite a ferocious start, the Americans couldn’t put away the underdog Serbs, who ran their cut-and-cut-again offense with precision and had a chance to tie it in the final seconds. But guard Bogdan Bogdanovic’s 3-pointer from the left wing was a little long and Kevin Durant secured the rebound and the relieved Americans walked off the floor with their streak intact but their standing shaken.

Kyrie Irving scored 15 points and Durant and Carmelo Anthony added 12 apiece for the U.S. team, which arrived in South American lauded as the latest version of an American super squad. However, after their 10-point win over the Aussies earlier this week and now a nail-biter against the Serbs, the rest of the field might be starting to believe the U.S. can be taken.

“We got in our own heads,” Durant said. “We had a great start, great start. We were up almost 20 points. We should have held the lead and we just got sidetracked by stupid stuff, from the calls to the physicality, the extra plays. We got to stay with it. That’s the way it’s going to be out here.”

Nikola Jokic, who plays for the Denver Nuggets, scored 25 and Milos Teodosic and Miroslav Raduljica 18 each for the Serbs, who fell to 1-3 but left the building feeling confident after making the Americans sweat.

Paul George said Serbia’s systematic offense was unlike anything he and his teammates have faced.

“Once again, we relied on natural talent,” George said. “This is why these guys are special in our league. These international guys really know how to move and really know how to cut. It’s more about how they’re running their offense. It’s wearing us down.

“It’s like they don’t get tired.”

It was the first Olympic game between the nations, and a rematch of the 2014 Basketball World Cup championship won by the U.S. 129-92. However, this never resembled that track meet as the Serbs slowed the tempo and forced the Americans into turnovers and rushed possessions. The world’s best team certainly didn’t look or play like it for long stretches.

The U.S., which will wrap up preliminary-round play against France on Sunday, led 94-87 with 2:11 left on a basket by Anthony. But the Serbs got a basket by Jokic and two free throws Teodosic to get within three.

Durant, who only attempted four shots, misfired with eight seconds left giving Serbia one last chance. After a timeout, the ball wound up with Bogdanovic, who had a great look from 22 feet but was just off the mark.

“We are that kind of a team that we never give up and we showed this today,” said Teodosic, one of Europe’s craftiest guards for the past decade. “This is third game in a row that we have a very bad beginning, and especially (against) the teams like the United States, it’s very tough to get back in the game when you are losing by 10 or 15 in the beginning.”

The 10-point win over Australia — just the fifth time the U.S. has won by 10 or fewer since 2006 — raised the possibility that this American team might not be as golden as previous ones.

Krzyzewski, though, insists there is more global balance in hoops.

“We don’t give enough credit to the talent level on the other team,” he said. “Australia is talented. Serbia is talented. They are one of the top teams in the world, but they’ve played together for a long time. We played them two years ago and had a great game and everything went well for us. All of those guys are back and I’m sure they wanted to make up for that, too.

“Our guys are playing as a team, and I think we just haven’t had that experience of playing that long together and hopefully these games will help us and the game against France will also.”

The Americans had better learn or they’ll be going home with a less shiny medal. 

U.S. WOMEN 81,

CANADA 51

By Doug Feinberg

AP Basketball Writer

RIO DE JANEIRO (AP) — There was no question coming into the Olympics that the U.S. women’s basketball team could score.

With the offense struggling at points Friday for the first time, the Americans turned up their defensive effort to dispatch Canada.

Maya Moore scored 12 points and the U.S. clinched the top seed in the group with an 81-51 win over its northern neighbors.

“I think we played really hard today on defense,” guard Sue Bird said. “Everyone’s been talking about our offense, but it’s been our defense that has been the most consistent. Tonight was a good example of that. It wasn’t that we couldn’t score, but we just weren’t scoring at the rate you saw in the first three games. It was our defense that was there for us to rely on.”

The Americans (4-0) had been scoring at a record pace, topping 100 points in each of their first three contests — the first time a team’s done that at the Olympics. But they couldn’t get into an offensive rhythm for the first 20 minutes against Canada.

The U.S. was out of sync, throwing the ball away on fast breaks and missing open shots. Canada, which already had sealed a berth in the quarterfinals for the second consecutive Olympics, wasn’t intimidated. The teams had played an exhibition game before the Olympics started and Canada lost by 40, never recovering from a slow start.

It was the U.S. that struggled early in this one. The Americans only scored 18 points in the first quarter, their lowest scoring output in any period in Rio. Canada only trailed 18-16. That’s when the U.S. turned up its defense. For nearly 10 minutes, the Americans held Canada without a basket and slowly extended their advantage.

Canada got its only bucket in the second quarter on a three-point play by Nirra Fields with 39 seconds left in the period and the U.S. led 36-22 at the half. Coach Geno Auriemma said the team did nothing special during that stretch other than just play hard defensively.

“Our defensive effort was great,” said Moore, who scored all of her points in the first half.

Diana Taurasi helped the U.S. get some separation against Canada. She hit two 3-pointers in a row to start an 8-0 run that gave the Americans their first 20-point lead of the contest. She now has 18 in the Olympics, breaking her own team record of 15 set in 2012.

Canada could only get within 15 the rest of the way. Miranda Ayim scored eight to lead the Canadians.

Despite the loss, Canada (3-1) has already won more games than in any other Olympics. The Canadians hope to win the country’s first medal in the sport. They finish pool play Sunday against Spain, trying to secure second place in the group.

“It’s huge, we’re here to make history,” Fields said. “We already made history and our goal is to really just medal. Finish the highest we can. Playing against Spain is a very important game and we’ll be ready for it.”

The victory was the Americans’ 45th straight in the Olympics. They are halfway to a sixth consecutive gold medal.

While the U.S. roster is stacked with some of the greatest players in UConn’s storied history, including Moore, Canada has its own Husky in Nurse, who will begin her junior year at Connecticut this fall. Nurse came into the game leading the team in scoring, but had a rough contest against the U.S. and her college coach Auriemma. She scored just three points, missing eight of her nine shots.

Nurse’s game probably could be summed up in one play: She had the ball stripped by Moore near the top of the key and then chased the former UConn great down the court as Moore converted a layup.

“We all have those moments, kind of welcome to the next level moments. I had them, she’ll have them,” Moore said. “And then when she’s in my position, she’ll be giving it to the next generation. So, it’s one play. We all have to get our pockets picked. But I was trying to be aggressive. I’m sure it’ll be something she uses for the next game.”

In other games on Friday, Serbia won its first contest ever in the Olympics, beating China 80-72. A victory over Senegal on Sunday would advance Serbia to the knockout round. Spain routed Senegal 97-43 in the late game Friday, setting up a pivotal game against Canada on Sunday.