CLEVELAND — While his famous daddy got dressed after the game, 3-year-old LeBron James Jr. practiced writing his letters and numbers on a dry-erase board inside the Cavaliers' locker room.

First, he drew an L. Then, a 2.

"Put up a 2 and 3 for me," No. 23 told his little namesake.

Maybe a 2 and 1 would have been more appropriate. The Cavaliers have trimmed Boston's lead in half.

The shots didn't drop again for James, and it hardly mattered. His teammates made most of theirs.

James scored 21 points on another off-shooting night, but Delonte West scored 21, Joe Smith had 17 and the Cavaliers raced to a large, early lead in Game 3 in a 108-84 victory last night over the road-challenged Boston Celtics to pull within 2-1 in their playoff series.

West, who spent three seasons with the Celtics, carried the scoring load for the Cavaliers, who are attempting to become the 14th team in NBA history to come back from an 0-2 deficit and win a best-of-seven series.

They've had practice at it.

Last year, the Cavaliers lost the first two games of the Eastern Conference finals to Detroit before beating the Pistons four in a row to advance to the finals for the first time. After dropping Games 1 and 2 in Boston, Cleveland needed James (8 of 42 in the losses) to shoot his way out of a slump.

James was only 5 of 16 from the floor, but his teammates stepped it up, going a combined 32 of 54 (59 percent). Cleveland roared to a 32-13 lead after one quarter, led by 17 at half, 16 after three and easily withstood a few Boston counter punches.

"We came out, jumped on them and didn't give it back," West said.

Although he's just 13 of 58 (22 percent) in three games, James was only concerned about one thing.

"The win is all that matters," he said. "I can't worry about how I'm shooting the ball."

The Celtics remain lost on the road, and Game 4 is tomorrow night in Cleveland.

They've yet to win outside of Massachusetts during this postseason, not an encouraging sign for a team with its sights on a 17th league title. The Celtics, who went a league-best 31-10 in away games during the regular season, dropped all three in Atlanta during the first round as the Hawks averaged 100.7 points and shot 47.6 percent in three home games.

"On the road it's going to take a little bit more ... we've got to learn our lesson pretty soon," an agitated Paul Pierce said. "We took our bumps. Hopefully, the guys are mad at the way we played because I'm totally upset at the way we played, especially with a great opportunity in front of us."

Kevin Garnett scored 17 points, Pierce 14 and Ray Allen 10 as Boston's Big 3 of superstars combined for 41 points.

But the trio was no match for Cleveland's Fab Four of West, Wally Szczerbiak, Smith and Ben Wallace — all acquired in deals at the Feb. 21 trading deadline — who totaled 63 points, 20 rebounds and six 3-pointers. West made four 3s, Smith went 7 of 8 and Wallace, who wasn't expected to play because of an inner ear infection, gave Cleveland an inside presence while guarding Garnett.

Big Ben added nine points and nine rebounds.

"He gave us a big lift every second that he was on the floor," Cavs coach Mike Brown said.

The Cavs played a nearly flawless first quarter. They shot 65 percent (13 of 20), had 11 assists on those field goals and didn't commit a turnover. Beyond that, Cleveland didn't rely on James to carry them, as six other Cavs combined for 27 of the club's 32 points.

"Can you ask a team to play better than that?" James said. "That was unbelievable."