KANSAS CITY, Mo. — The No. 6-ranked Kansas Jayhawks, who tied Baylor for the Big 12 regular-season title, completed a three-game sweep of West Virginia, TCU and Texas Tech on Saturday to win the league’s postseason tournament at T-Mobile Center. David McCormack scored 18 points and grabbed 11 rebounds while four other Jayhawks scored in double figures as KU (28-6) downed the No. 14-ranked Red Raiders, 74-65, and likely emerged as the league’s top representative entering Selection Sunday. KU won the Big 12 Tournament for the first time since 2018 and 12th time overall. Backup power forward Mitc…