Josh Dix drilled a game-winning, buzzer-beating 3-pointer en route to 22 points to lift Iowa to an 80-79 victory against visiting Northwestern on Tuesday in Iowa City, Iowa.The Hawkeyes (7-1, 1-0 Big Ten) sputtered in the second half of their conference opener before rallying, with Dix punctuating the victory with a 26-footer from just left of the key.Payton Sandfort had 20 points and seven rebounds, while Owen Freeman (16 points) and Brock Harding (12) also finished in double figures as Iowa withstood a trio of big efforts from the Wildcats (6-3, 0-1).Northwestern’s Brooks Barnhizer notched a double-double of 21 points and 10 rebounds, Ty Berry scored 20 points and Nick Martinelli added 19.Northwestern led by as many as six down the stretch but managed only one field goal over a 1:32 stretch as Iowa whittled the deficit to 76-75 with 43 seconds to play.A pair of Barnhizer free throws pushed the advantage back to three before a Harding layup with 15 seconds left. Harding missed a free throw and a tying three-point play, but Northwestern left an opportunity for Iowa when Berry split a pair of free throws with seven seconds left.Harding dished a game-high eight assists.Iowa netted a pair of layups to start the second half to take a 49-34 lead but largely went cold after that.