MIAMI, Nov. 23 (Ticker) -- It still may be early in the season, but the Miami Heat are showing an inability to raise their game against Western Conference opponents.

Zach Randolph scored 24 points and Derek Anderson added 19 as the Portland Trail Blazers snapped a three-game road losing streak with a 99-87 victory over the Heat.

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Miami, which is unbeaten in seven games against the Eastern Conference, has lost four of five against the Western Conference this season.

"We don't look at it as East vs. West," said Miami guard Dwyane Wade, who was held to 19 points -- just the second time this season that he has not reached the 20-point plateau. "We're just trying to win as many games as we can and play the games as they come along."

After a three-point play by Wade gave the Heat a 49-44 lead with just under two minutes remaining in the first half, Randolph scored seven points in an 11-0 run that made it 55-49 with 10 minutes left in the third quarter.

"(It was) the best game we played this year, both offensively and defensively" Portland coach Maurice Cheeks said. "We shared the ball and, as crazy as it sounds, our defense was shared by all."

Portland never trailed in the second half and began to pull away when Anderson hit two big 3-pointers in the final 2½ minutes of the third period as the Blazers took a 74-66 lead into the fourth.

"I got the ball in my hands a lot tonight," Anderson said. "Coach gave me the ball. I wasn't just sitting in the corner waiting for the ball. I got in a rhythm tonight."

The Heat's only other home loss this year was to the Dallas Mavericks -- another Western Conference opponent.

"I don't even think it's psychological with any of them because they've never been in the West except for Shaq," Anderson said. "We in the West feel like it's a playoff game every game. If we don't win, we know there are 10 other teams that can beat us in the playoffs. Maybe it's that difference of attitude."

Nick Van Exel sealed the win by scoring six of his 15 points on two 3-pointers in a 10-4 spurt that pushed the advantage to 84-70 with 7:35 to play. Miami got no closer than seven the rest of the way and lost for the fifth consecutive time to Portland.

The Blazers, who entered the game shooting just 32 percent from the arc, made 47 percent (8-of-17) of their 3-pointers.

"They shot very well," Miami coach Stan Van Gundy said. "They came in as one of the worst 3-point shooting teams in the league, but they certainly buried them tonight. The effort wasn't there for us tonight at the defensive end."

Randolph also grabbed seven rebounds and blocked a career-high five shots for the Blazers, who improved to 14-3 all-time in Miami. Portland finished with a 41-36 rebounding advantage.

"We were absolutely crushed on the boards again," Van Gundy said. "I have to take responsibility for that. There were times when we looked hesitant and unsure, and when that happens, you have to take responsibility as a coach."

Wade was held to just five points on 1-of-6 shooting in the second half as Miami shot just 38 percent (15-of-40) in the final 24 minutes.

"They were double-teaming me every time I came off a screen," Wade said. "We have to hit the open man, and we have to hit the open shots. That's something we have to work on."