AUBURN HILLS—Mitch McGary had 21 points and 14 rebounds, and fourth-seeded Michigan breezed through Virginia Commonwealth’s vaunted pressure with a clinical performance Saturday, beating the fifth-seeded Rams 78-53 to advance to the NCAA round of 16 for the first time since 1994.VCU (27-9) was relentless in a 46-point rout of Akron on Thursday night, but the Rams met their match against Michigan’s cool-headed backcourt. Trey Burke and Tim Hardaway Jr. rarely looked rattled against VCU, and although Michigan (28-7) committed 12 turnovers, the Rams couldn’t turn many of them into quick scoring opportunities.McGary, a 6-foot-10 freshman, set season highs in scoring and rebounding. VCU had no answer for him around the basket, and when the Rams couldn’t create easy baskets with their pressure, they were finished.