PHOENIX, May 22 (Ticker) -- Brent Barry and the San Antonio Spurs looked unstoppable in their half-court offense.

Barry scored 13 of his 21 points in a blistering fourth quarter as the Spurs looked like the team with high-powered offense in a 121-114 victory over the Phoenix Suns in Game 1 of the Western Conference finals.

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Tony Parker scored 29 points and Tim Duncan had 28 and 15 rebounds for the Spurs, who put on a clinic on the offensive end of the floor in the fourth quarter to quickly gain the home-court advantage from the NBA's best team.

The Spurs displayed championship poise in the fourth quarter, scoring 43 points on 72 percent (16-of-22) shooting.

"Not a situation we expect to be in, scoring that many points in the fourth quarter, but an opportunity we'll take," Duncan said.

"We can play a couple of different ways" Barry said. "We can play big and slow and methodical. We also can run and compete with the best team in the West, and that's Phoenix."

Barry, quiet the entire postseason, stepped up big in the final period by making three 3-pointers and all five of his shots. He made back-to-back shots from the arc 39 seconds apart to cap a 12-4 surge and give the Spurs a 106-98 lead with 4:08 remaining.

"It is all predicated on Tim being down in the block and scoring, causing problems," Barry said. "There is so much focus down there when they double team him it leaves avenues for open opportunities so do your best to knock things down."

"He (Barry) came up huge," Parker said. "I am very happy for him because he's been struggling the whole season. He played great tonight. I hope he's going to keep it going because we need him."

When Barry wasn't bombing away from the outside, Parker and Duncan also proved too difficult to handle. Parker used his quickness to his advantage, going to the basket to both score and set up Duncan, who also was effective by passing out of double teams.

"We want to play games in the 90s and the 80s, but when opportunities are there, we're going to take the shots," Duncan said. "I thought we did a great job of mixing the tempos, playing controlled at times and when the opportunity was to do it we pushed it back out."

"Their pace isn't going to change," Spurs coach Gregg Popovich said. "We play half-court basketball and we fast break. We do both. But we don't plan to play just a flat half-court game. We haven't all year long."

Amaré Stoudemire overcame early foul trouble and scored 41 points and reigning MVP Steve Nash had 29 and 13 assists for the Suns, who trail in a series for the first time this postseason.

"It was defensive breakdowns more than anything," Nash said. "I think we scored enough points to win and played well enough offensively."

While the Spurs scored when they wanted, they also showed why they were the NBA's best defensive team during the regular season, limiting the Suns to just six fast-break points. Phoenix had been averaging 19.5 fast-break points in the postseason.

"No fast-break points the whole night," Suns coach Mike D'Antoni said. "I don't think we had enough energy that we could get over the hump." After being contained in the first half, the Suns came out energized in the third quarter, using a 21-9 run in just under five minutes to take a 70-64 lead. Jim Jackson drilled three 3-pointers in the surge that Stoudemire capped with two free throws at the 6:53 mark.

Jackson scored 20 points on 8-of-16 shooting and also made four of the Suns' six 3-pointers.

All-Star Shawn Marion made two foul shots with 90 seconds left in the third quarter, giving the Suns their biggest lead at 82-74.

However, it was a completely ineffective game for Marion, who scored just three points on 1-of-6 shooting. He was guarded by both Duncan and Bruce Bowen at times.

"I didn't think Shawn had an abundance of energy," D'Antoni said. "I think he was a little tired. He will be back."

It also was a rough game for Suns forward Quentin Richardson, who scored seven points on 3-of-9 shooting.

Duncan and Manu Ginobili made four free throws to close the third quarter and the Spurs scored the first seven points of the fourth quarter to take an 85-82 lead.

Ginobili scored 21 points and Robert Horry 12 for the Spurs, who shot 52 percent (45-of-87), made 10-of-23 attempts from the arc and held a 45-41 rebounding advantage. Ginobili also had the game's biggest highlight, hitting a shot from beyond halfcourt to end the first quarter.

A dunk by Steven Hunter with 9:24 remaining gave the Suns their last lead at 88-87.

Duncan's dunk with 6:24 left snapped a 94-94 tie, giving the Spurs the lead for good while starting the decisive surge.

Stoudemire, who fouled out in Game 6 at Dallas on Friday, picked up two fouls in less than four minutes and the Spurs took advantage and built a 30-20 lead after one quarter.

However, Stoudemire returned and scored 18 points in the second quarter that ended with the Spurs holding a 55-49 lead.

The Suns shot 49 percent (42-of-86) in falling to 4-2 at home in the postseason.

Phoenix hosts Game Two on Tuesday.