The Panthers (14-1, 2-0) shot 53 percent from the floor and had pulled away from the Terrapins in the second half to win their first Atlantic Coast Conference home game.
Seth Allen led Maryland (10-6, 2-1) with 18 points but the Terrapins couldn’t keep up with the Panthers, who have quickly made themselves at home in their new conference after moving over from the Big East this fall.
Johnson, limited by the flu in a victory at North Carolina State on Saturday, keyed a late first-half surge that put Pitt in front and kept it going in the second half. The Panthers used a 15-7 burst to build a 13-point lead, then pulled away.
The Terrapins were looking for their first 3-0 start in ACC play since 2002, when they went on to win the national title behind Juan Dixon and Steve Blake.
Pitt used a lineup that spread the floor, giving Patterson and Johnson room to work. Patterson, who is developing into one of the ACC’s best all-around players, kept the Panthers in it after the Terrapins got off to a hot start.
POSTPONED: The women’s basketball game scheduled for Monday night between No. 22 Indiana and No. 21 Purdue has been postponed because of bad weather.
No makeup date has been announced.
AP POLLS: Arizona is No. 1 in The Associated Press college basketball poll for the fifth consecutive week, but for the first time in that span there are changes in the Top 25.
The Wildcats (15-0) were still a runaway No. 1, with Syracuse, Ohio State, Wisconsin and Michigan State remaining the next four teams. Arizona received 60 first-place votes from the national media panel, while Syracuse (14-0) got the other five.
Wichita State was sixth, followed by Baylor, Villanova, Iowa State and Florida.
Duke, which lost at Notre Dame, dropped to No. 16, the first time the Blue Devils are out of the Top 10 since December 2007.
No. 23 Illinois and No. 25 Kansas State moved into the rankings for the first time.
Connecticut remained No. 1 in the women’s basketball poll. Notre Dame, Duke, Stanford and Louisville followed the Huskies.