Miles Kelly scored a game-high 22 points and added 12 rebounds to help lead Georgia Tech to a 67-59 upset win over visiting No. 21 Mississippi State on Tuesday in Atlanta.Kyle Sturdivant added 12 points for Georgia Tech (3-2). Naithan George also had 11 points for the Yellow Jackets in the inaugural ACC/SEC Challenge.Mississippi State (6-1) was paced by Josh Hubbard, who had 17 points. Dashawn Davis scored 12 points for the Bulldogs, who struggled to find a rhythm on offense, connecting on just 20 of their 65 shots from the field (30.8 percent) and just seven of their 30 3-point tries (23.3 percent).D.J. Jeffries added 10 points for the Bulldogs, while Jimmy Bell Jr. grabbed a game-high 13 rebounds.The Yellow Jackets never trailed as first-year head coach Damon Stoudamire posted the first power-conference win of his Georgia Tech tenure.A Hubbard basket knotted the score at 13 with 11:03 remaining in the first half, the last time Mississippi State was level. Georgia Tech followed with an 11-2 run that was punctuated with a Kelly 3-pointer, one of his four in the game.Georgia Tech led by as many as 16 in the second half before a late Mississippi State run cut the deficit to eight on a pair of free throws from Davis with 2:44 remaining.