For Kassius Robertson, it doesn't matter if he is having a good shooting night or a bad night, his mindset doesn’t change.

Monday he had a terrific shooting night.

Two days after he shot 3-of-12 from the field, finishing with 11 points, he missed just three shots and finished with a game-high 23 points. The Cansius transfer helped Missouri to its second win of the season, a 99-55 win over Wagner. 

“Percentage-wise I really struggled last game, even though we got a really good win,” Robertson said. “It’s nice to come out and do what I do.”

Robertson came to Missouri known as a shooter. He has had to adjust to the point guard role for the first time in his career and, against Wagner, added three assists to just one turnover. 

“When you design plays for him to be a two-guard and all of a sudden he plays the one, now he is handling the ball and guys are getting inside of his legs. Not to make any excuses,” coach Cuonzo Martin said. “We just have to find a way to get him the ball where he can get shots in rhythm, because he is always shot ready.”

Missouri played without Michael Porter Jr. the nation’s top recruit on Monday, after he played just two minutes on Friday. On Friday, Porter tweaked a leg injury in pregame warmups and is day-to-day as of Monday, Martin said.

Porter Jr. watched the game from the locker room, Robertson said. Martin said he is unsure of the seriousness of Porter Jr.’s injury or if he will fly with the team to Utah on Thursday. 

“I don’t know how serious it is,” Martin said. “I think it’s day-to-day. That’s the best assessment for me to say right now is day-to-day.”

Missouri didn’t struggle with Wagner at all, even without Porter Jr.

The Tigers had five players in double figures. Along with Robertson’s 23, senior Jordan Barnett had 13 points, juniors Kevin Puryear and Terrence Phillips each had 12 and freshman Jontay Porter had 11 points. 

Barnett got the game started with a bang. 

The St. Louis native stole the ball from Wagner forward Nigel Jackson and threw down an emphatic fastbreak dunk. The fans who filed into Mizzou Arena broke into a frenzy and Missouri had its first lead of the game. 

The Tigers, who led every second after that, got hot early and never cooled off. Missouri shot 68 percent from the field and 55 percent from behind-the-arc.

A Robertson three-pointer less than five minutes into the game gave the Tigers a 13-3 lead. Missouri’s lead never went under double digits the rest of the game.

In fact, it took Wagner seven minutes and 54 seconds to score its second basket of the game. Missouri’s defense held Wagner to just 33 percent shooting from the floor and 30 percent from deep. 

Missouri pushed its lead to 20 after a Jontay Porter jumper in the lane, with 8:52 left in the first half. 

The younger of the two Porter brothers showed why he was also a highly-regarded prospect out of high school. Porter, who was ranked as the 25th player in the 2017 class, finished with eight rebounds and four assists to go with his 11 points.

It was his first career collegiate double-digit performance and he showed off his entire skill set.

“He is a good player,” Martin said. “He is a guy that does a lot of good things. He rebounds, he can pass the ball, he does a good job defending. With him it’s about being shot ready.”

Missouri led 54-21 at halftime and never looked back.

A Jeremiah Tilmon free throw, with 11:31 left to play, pushed the Tigers' lead to 40. Tilmon, who finished with 14 points, seven rebounds and just three fouls Friday night, fouled out in 10 minutes with seven points and two rebounds.

With Tilmon out the Tigers showed off their post depth. Reed Nikko, a 6-foot-10 forward, had eight points and was tied with Porter with eight rebounds. 

“We are so deep and versatile that when one player goes out the next player steps up,” Porter said of the team’s post play. 

Missouri’s largest lead of the game was 49.

The Tigers will travel to Utah on Thursday for their first road trip of the season. 

REDSHIRTS: Neither CJ Roberts or Mitchell Smith dressed for Monday’s game. Martin confirmed that the Tigers will redshirt both. Roberts is a 6-foot freshman guard, while Smith is a 6-10 sophomore forward, who averaged 2.4 points last season.

HARRIS GOES DOWN: Blake Harris went down on an layup attempt with six minutes left in the first half. Martin said he is unsure of the status of Harris’ injury, but said that the 6-foot-3 freshman guard injured his leg on the play. 

“We will see how it goes in the morning,” Harris said.

NEWEST POLL: The Tigers picked up 32 votes in the latest Associated Press Top-25 poll. Missouri is fifth among Southeastern Conference teams, behind Kentucky, Florida, Texas A&M and Alabama.