B.J. Edwards recorded 16 points, 10 rebounds and seven assists and Southern Methodist held Northern Iowa without a field goal for the final four minutes en route to a 73-63 opening-round NIT win on Wednesday in Dallas.Consecutive 3-pointers by Northern Iowa’s Trey Campbell, the second with 4:10 to go, cut the Mustangs’ lead in half to 63-60. SMU (24-10) responded with five straight points from Chuck Harris and then a Kario Oquendo put-back.The 7-0 run gave SMU a 10-point lead that proved insurmountable for the Panthers (20-13), and Oquendo’s basket was indicative of one of the game’s key developments.The Mustangs outrebounded Northern Iowa 44-30, including an 11-2 advantage in offensive boards. SMU converted those offensive rebounds into 10 second-chance points, while the Panthers went without a second-chance point.SMU also scored 16 points off turnovers to Northern Iowa’s seven, and 17 fastbreak points to the Panthers’ nine.The Mustangs pushed the tempo to help overcome 3-point shooting woes on a night when they went just 6-for-23 (26.1 percent) as a team from beyond the arc. Two of SMU’s six made triples come in a critical stretch midway through the second half, however, both from Oquendo.He knocked down the 3-pointers as part of a 18-5 Mustangs run that turned a six-point Northern Iowa lead into a seven-point SMU advantage. The Mustangs never trailed from that point.