Nowitzki scored 12 third-quarter points on 6-for-6 shooting to lead the Mavericks to their third straight victory and seventh in nine games.
Eisley gave Dallas the lead for good with a 3-pointer that made it 68-66 with 31.6 seconds left in the third quarter.
Dallas trailed by as many as 19 with 2:22 left in the second quarter after the Dikembe Mutombo blocked Shawn Bradley’s attempted dunk and Brevin Knight hit a pair of free throws and a 16-foot jumper to make it 48-29.
Jason Terry led the Hawks with 21 points as Atlanta lost its fourth straight to the Mavericks. The Hawks have dropped three straight overall and nine of 11. Dikembe Mutombo had 21 rebounds.
Dallas played its second straight game without point guard Steve Nash, who is day to day with a sore left hamstring. Acting coach Donn Nelson again moved Eisley from shooting guard to point guard, Michael Finley from forward to shooting guard and started Gary Trent at forward.
Finley had 15 points