KANSAS CITY, Mo. -- Marshall Henderson had a horrible first 28:39 of the game. Unfortunately for Wisconsin, a college game still requires 40 minutes.
Henderson had two points and was 1-of-13 from the field (including 0-of-6 from 3-point range) when his first long-ranger went in with 11:21 left in the second half.
It triggered something, because he exploded for 17 second-half points to help No. 12 seed Mississippi defeat No. 5 Wisconsin, 57-46, in the second round of the NCAA tournament at Sprint Center.
"I was waiting for that first three to go down," Henderson said. "A few of my shots were rimming in and out, just a little long. That was frustrating.
"But Coach has told me all year to be a 'serial killer.' I just have to keep shooting. When that went in, we were down by three points. Everything started falling from that point."
Henderson, who came into the game averaging 20.1 points per game, scored 19 points, but on 6-of-21 shooting.
Henderson finished 3-for-12 from long range.
"We've seen this show before," Mississippi coach Andy Kennedy said. "If you go 0-for-5, it's going to be a long night; if you go 5-for-5 it's going to be a great night.
"As long as he's taking shots within our offense, our guys understand. Once he makes a big one, we just keep feeding him and feeding him."
With Mississippi (27-8) clinging to a three-point lead with 2:49 remaining, Henderson drained a 35-footer with plenty of shot clock left to give the Rebels a comfortable cushion.
Henderson scored 17 of Mississippi's final 27 points.
"I thought we did a pretty good job on Henderson in the first half," Wisconsin's Jared Berggren said. "He made some pretty tough shots in the second half. We knew he was going to get going. It doesn't take much to get a player like that going. He got hot and did what he does."
Added the Badgers' Sam Dekker: "Henderson got some big shots. When he hits those, if you're not stopping that they're going to be a tough team to beat."
The Rebels will face the winner of the No. 13 LaSalle vs. No. 4 Kansas State in Sunday's third round.
Neither team could muster much offense, mainly because of horrid shooting. The Rebels shot 39 percent, although they did connect on 48 percent in the second half.
Wisconsin (23-12) hit only 25 percent of its shots.
The first half was back and forth, with the largest lead by either team four points before Dekker of Wisconsin hit a 3-piont shot with 26 seconds remained in the half.
Mississippi answered with its own 3-point play to cut the halftime lead to 25-22.
The Badgers shot only 30 percent in the first half, while the Rebels connected on only 31 percent of their shots.
Wisconsin was led by Dekker, who scored 10 points in the first half. Reginald Buckner led Ole Miss with seven points.
Henderson was held to two points in the half on 1-of-11 shooting, including 0-of-4 from 3-point range.
NOTES: Mississippi coach Andy Kennedy reached 20 wins for the sixth time in his seven seasons in Oxford. The program had won 20 games seven times in the 96 seasons before Kennedy's arrival. ... The Rebels are making their seventh appearance in the NCAA tournament, and first in 11 years ... Wisconsin was appearing in its 15th straight NCAA tournament, and 20th overall. The Badgers won the championship in 1941. ... Kennedy (SEC) and Wisconsin's Bo Ryan (Big Ten) won their conference's coach-of-the-year honors.