WICHITA, Kan.-- Michigan's NCAA Tournament opener involved a lot of waiting.The Wolverines waited a week to learn their opponent and four additional days to take the court, then drew the late tip in Wichita.And to fully test Michigan's patience, Thursday's game with Montana was halted for 10 minutes due to a clock malfunction.All the waiting was worth it.Michigan beat Montana 61-47 to advance to the Tournament's second round, where it will face 6 seed Houston Saturday night.Tip time for that game is not yet known.The No.3 seed in the West Region and a trendy pick to reach the Final Four, Michigan stumbled out of the gate against the 14 seed from the Big Sky Conference.Michigan spotted Montana one point for each day the Wolverines had gone since last playing, and trailed 10-0 at the 15:59 mark.By then, Michigan's starting backcourt was on the bench in foul trouble and its offense looked flustered by Montana's aggressive trapping.But as has been the case so often this season, Michigan's bench provided an early boost, and Montana had no answer for Charles Matthews, who finished with 20 points and 11 rebounds, both team highs.Muhammad-Ali Abdur-Rahkman (11 points) was the only other Wolverine in double figures.Michigan (29-7) once again relied on its stingy defense, limiting the Grizzlies to 32 percent shooting, including just 3-of-15 (20 percent) from 3.Montana's aggressive backcourt of Michael Oguine and Ahmaad Rorie combined for 30 points, but the rest of the Grizzlies were contained.It will take another strong defensive effort to contain Houston's Rob Gray, who poured in 39 points, including the final two, in a 67-65 win over San Diego State earlier Thursday night.It wouldn't hurt Michigan to get off to a better start either.After going 10 days without playing following its March 4 Big Ten Tournament championship win, U-M was out of sorts early.Moritz Wagner fell and traveled trying to retrieve the opening tip, and it only got worse.Muhammad-Ali Abdur-Rahkman picked up a foul 11 seconds in and went to the bench.Zavier Simpson was whistled on the next defensive possession and picked up his second at the 15:59 mark, when a Montana basket and free throw made it 10-0 Grizzlies.Matthews finally got Michigan on the board with a strong drive at the 15:43 mark and Michigan found a groove.Jaaron Simmons' drive cut the deficit to 12-8.Michigan made it 17-15 after another Simmons basket and a Jon Teske free throw.Eli Brooks' baseline floater tied the game at 19 with 5:30 left.None of those three Wolverines started the game.Michigan took its first lead, 22-19, on deep Abdur-Rahkman 3 with 3:59 left in the half.The Wolverines exploited Montana's traps by having Wagner at the foul line, feeding Matthews cutting along the baseline.Matthews scored 12 first-half points.Michigan went up 31-25 with just under a minute left but Ahmaad Rorie's 3 made it 31-28 at half.Michigan went up 38-30 on Simpson's 3 with 17:25 left, but a clock malfunction shortly after stopped