The Atlanta Hawks lost to the Dallas Mavericks 127-113 at home at Philips Arena.  This was the second and final meeting between these two teams this regular season.  This was also the second game of a back-to-back set for the Hawks.  With the loss, the Hawks dropped to 37-30 on the season, 1-1 in the regular season series with the Mavericks, and 1-1 in their back-to-back set.  The starters for the Hawks were Jeff Teague and Devin Harris in the backcourt, Kyle Korver and Josh Smith at the two forward positions, and Al Horford at center.  Louis Williams (torn ACL, right knee) and Zaza Pachulia (sore right Achilles) were the two inactives for the Hawks.  DeShawn Stevenson (knee) dressed but didn't play.  Johan Petro received a DNP-CD.  The leading scorer for the Hawks was Jeff Teague, with 19 points.  He also dished out seven assists.  Al Horford added a double-double, with 16 points and 11 boards.  Josh Smith contributed 13 points, six dimes, and five rebounds.  Anthony Tolliver scored 12 points off the bench.  Kyle Korver had 11 points.  Devin Harris, Ivan Johnson, and John Jenkins pitched in with 10 points apiece.  The leading scorer for the Mavericks was Darren Collison, with 24 points.  In the first quarter, the Mavericks went on a 23-12 run and led by nine at the end of one.  In the second quarter, Darren Collison went off for 15 points and helped extend the Mavs' lead to 68-55 at the break.  In the second half, the Mavericks only outscored the Hawks by one, but the Hawks lost by 14.  I think the key reason the Hawks lost was underestimating this Mavericks team.  Riding a three-game winning streak, the Hawks came into this game and slacked on defense, allowing at least 29 points in each quarter.  This one really hurts, since the Hawks had a chance to improve their playoff positioning even further against a sub-.500 Mavs squad.