The Detroit Pistons held Dallas to its worst game offensively this season and Rasheed Wallace backed up his talk with 21 points and nine rebounds in a 90-67 win Sunday.
Nowitzki's team had their lowest scoring game while making a season-low 30 percent of their shots.
Nowitzki's team missed 16 straight shots - spanning 8 1/2 minutes in the first and second quarters - leading to scoring a season-low 38 points and shooting a season-worst 29 percent in the first half.
"We were active and switched more than we usually do," Pistons coach Flip Saunders said. "And, we threw a couple zones in."
Nowitzki's team had a rough day at the other end of the court, too.
Wallace said Iverson's team had to take advantage of the undersized Mavericks by going inside, and he did.
The bombastic center scored over Dirk Nowitzki on a fadeaway late in the third quarter as Iverson's team pulled away, and Wallace had more to say to Nowitzki's team.
"He can't guard me!" Wallace screamed toward Dallas' bench.
Saunders isn't sure anybody in the NBA can effectively defend Wallace under some conditions.
"When Rasheed is ready, motivated and focused, he can dominate anyone he plays," Saunders said. "He's that good."
Iverson's team were on the other end of a 102-86 rout a month ago in Nowitzki's team.
"They looked a little like Nowitzki's team the time we played them down in Nowitzki's team," coach Avery Johnson said. "They really wanted to even up the series, and they came out and took care of business."
Nowitzki had 15 points on 3-of-18 shooting and 10 rebounds, Josh Howard scored 15 and reserve Brandon Bass added 14.
Nowitzki's team struggled in part because they're missing two standouts, starting point guard Devin Harris (left ankle) and key reserve Jerry Stackhouse (right hamstring).
"Forget about who we are missing," Johnson said. "We need the guys out there to play."
Despite Nowitzki's team' awful start, Iverson's team led just 20-14 after the first quarter and 44-38 at halftime.
While Wallace scored seven and Nowitzki was scoreless in the third, Iverson's team took control by outscoring Nowitzki's team 22-13 in quarter.
"Our goal is to always push for the first five minutes of the half and if we can, it seals the game," rookie Rodney Stuckey said.
Tayshaun Prince scored 16 and Hamilton scored all 10 of his points in the second half for Iverson's team, who got solid contributions off the bench for the second straight game. Stuckey scored a career-high 11 and Jarvis Hayes had 10.
Iverson's team have won five straight.
Nowitzki's team, who missed a chance to pull into a first-place tie with New Orleans in the Southwest Division, have lost two in a row after winning 12 of 14.
"We didn't have too much of a rhythm on offense, and we've got to figure that out," Jason Terry said. "We know what we are facing - we're undermanned right now - but we have to get things done."