The Atlanta Hawks lost to the Boston Celtics 107-102 in overtime on the road at the TD Garden.  With the loss, the Hawks dropped to 34-27 on the season and 1-2 in the regular season series with the Celtics.  The loss also cost the Hawks in the standings, as they now have been brought down to the seventh seed in the Eastern Conference.  The starters for the Hawks were Jeff Teague and Devin Harris in the backcourt, Josh Smith and Al Horford at the two forward spots, and Johan Petro at center.  The two inactives for the Hawks were Louis Williams (torn ACL, right knee) and Zaza Pachulia (sore right Achilles).  Ivan Johnson did not make the trip to Boston due to personal reasons.  DeShawn Stevenson (knee) dressed but didn't play.  Shelvin Mack and Mike Scott received DNP-CDs.  The leading scorer for the Hawks was Josh Smith, with a game-high 32 points.  He also dished out nine assists and grabbed eight boards, nearly registering a triple-double on the night.  Jeff Teague added 26 points and nine assists, nearly getting a double-double.  Al Horford contributed a double-double, with 22 points, 13 rebounds, and five dimes.  Devin Harris scored 12 points.  The leading scorer for the Celtics was Paul Pierce, with 27 points.  In the first quarter, the Celtics outscored the Hawks 28-26.  In the second quarter, the Celtics outscored the Hawks 24-21 as they extended their lead to 52-47 at the half.  In the third quarter, the Hawks outscored the Celtics 21-20 and cut the Celtics' lead to four heading into the final frame.  The Celtics began the fourth quarter with a 10-0 run, but the Hawks quickly responded with a 13-4 run.  With the game tied up at 94, both teams missed potential game-winners, and the fans at the TD Garden were treated to free basketball.  However, after the Hawks took a four-point lead in OT, the Celtics went on an 8-1 run, and the Hawks lost by five.  The Celtics beat the Hawks the same way the Hawks beat the 76ers on Wednesday -- shooting.  The Celtics shot over 50% from the field and from beyond the arc, and they shot 85% from the charity stripe.  It's tough to win when the other team is shooting that well, and the Hawks fell just a bit short in this nationally-televised rematch of their 2008 and 2012 first round playoff series.