INDIANAPOLIS, May 6 (Ticker) -- Ron Artest playing through pain was not a surprise. Jamaal Tinsley's performance was.

Artest overcame migraine headaches to score 25 points and Tinsley was nearly perfect from the floor en route to 17 as the Indiana Pacers rolled to a 94-81 victory over the Miami Heat in Game 1 of the Eastern Conference Semifinals.

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Jermaine O'Neal and the Pacers took a 1-0 lead over the Heat.
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Artest missed the shootaround and was considered questionable for the series opener. But he was inserted in the starting lineup and helped lead the Pacers to a decisive win.

The NBA Defensive Player of the Year made 7-of-17 shots from the floor, 10-of-13 free throws, grabbed six rebounds and handed out four assists.

"Ron was a monster," Heat coach Stan Van Gundy said. "He has such a great knack for the game. He makes difficult shots and gets to the line. He's a great player."

Indiana led by as many as 23 points in third quarter, but Miami climbed within eight twice in the final five minutes. Artest answered with a pair of free throws both times and Reggie Miller put away the game with a 3-pointer that gave the Pacers an 87-76 cushion with 3:09 left.

Indiana got a huge lift from Tinsley, who made 6-of-7 shots, including 5-of-6 from 3-point range. He scored just 33 points on 13-of-30 shooting in a first-round sweep of Boston.

"I was wide-open tonight and they were just falling," Tinsley said. "When teams double (Jermaine O'Neal) and Ron, they leave me open."

"We weren't trying to leave him open," Van Gundy said. "Statistically, he usually hits two or three of six attempts. Today, he hit 5-of-6. They are a good shooting team and tough to stop on the inside."

Miller finished with 12 points and O'Neal added 13 on 5-of-17 shooting for the Pacers, who shot just 44 percent (30-of-69) from the floor but made 9-of-18 3-pointers and 25-of-32 free throws.

"(The Heat) are a strong-willed team, we have to be as tough as them," Indiana coach Rick Carlisle said. "This is going to be a tough series. Miami is an unrelenting team at both ends."

Dwyane Wade scored 22 points and Rafer Alston added 17 off the bench as Miami shot 38 percent (32-of-84) just two days after finishing their grueling first-round series against the New Orleans Hornets.

"Obviously, they defended us really well," Van Gundy said. "I have no excuses. They just outplayed us."

Caron Butler collected 14 points and nine rebounds and Lamar Odom had 12 and seven to help the Heat to a 47-39 rebounding advantage. They grabbed 16 offensive boards.

Indiana had a 42-36 lead before Jeff Foster and Jonathan Bender capped the first half with back-to-back baskets to spark a 16-0 run. Tinsley buried a pair of 3-pointers as the Pacers opened the second half with 11 straight points to take a 57-36 lead.

"It took us a while, but we finally got going. We just ran out of time," Heat guard Eddie Jones said. "We have to quit digging ourselves into holes like we have all season."