Providence, R.I. >> John Calipari is heading to the Sweet 16 for the 16th time, guiding the Arkansas Razorbacks past nemesis Rick Pitino and second-seeded St. John’s 75-66 to bring his fourth school to the NCAA Tournament’s second week.

Billy Richmond III scored 16 points and Karter Knox had 15 for the 10th-seeded Razorbacks, who sent Kansas and their Hall of Fame coach Bill Self home from the “Region of Coaches” in the first round.

But the victory over his longtime rival was especially sweet for Calipari.

Zuby Ejiofor had 23 points and 12 rebounds for Big East champion St. John’s (31-5) — an unprecedented sixth school Pitino has taken to the tournament. His history in Providence — the Friars reached the 1987 Final Four in his tenure — gave him a home-court advantage.

Purdue 76, McNeese 62 >> Trey Kaufman-Renn had 22 points and 15 rebounds, and the Purdue Boilermakers used a fast start to roll to a win over McNeese in the second round of the NCAA Tournament.

Michigan 91, Texas A&M 79 >> Michigan is going back to the Sweet 16 a year after a 24-loss season, using Roddy Gayle’s surge to beat Texas A&M.

Texas Tech 77, Drake 64 >> Darrion Williams scored a season-high 28 points, JT Toppin had 25 points and 12 rebounds, and No. 3 seed Texas Tech dominated No. 11 seed Drake in the paint on its way to a victory.