It’s not always as impressive as its fans — or probably its players and coaches — would prefer, but No. 19 Memphis continues to win even when it doesn’t play its best.After muddling through a first half in which it led by only three points in a 68-56 American Athletic Conference win at Tulane on Thursday night, the Tigers will try for a more consistent performance Sunday afternoon when they journey to Houston for a conference date with struggling Rice.”As long as you win those games, I’m not going to look at everything as a negative,” Memphis coach Penny Hardaway said.The Tigers (17-4, 7-1), who have won four games in a row and eight of their past nine, are tied with North Texas atop the AAC despite some mediocre outings.While they defended well at Tulane, limiting the Green Wave to 36.2 percent shooting from the field and 4 of 24 from the 3-point line, Memphis shot only 44.8 percent from the floor and couldn’t exhale until a Colby Rogers 3-pointer with 2:07 left gave them a 64-54 lead.Rogers gave Memphis fans some hope that he might be emerging from a shooting slump. He hit four 3-pointers and scored all 14 of his points in the second half at Tulane, boosting his scoring average to 11.4 points per game.Last season, he averaged a career-high 16.5 points while playing for Wichita State.Rogers and Dain Dainja each picked up slack Thursday for PJ Haggerty, who endured a rare off-night with just eight points on 3-of-11 shooting from the field.Haggerty still enters Sunday’s game averaging a team-high 21.4 points a game, which ranks fifth in Division I.And Hardaway said he appreciates his team’s ability to pull together for a win when its top players struggle.”Winning tough games shows you who you’re really working with,” Hardaway said.