SportsTicker reports: Alonzo Mourning’s retirement is off just hours after the Miami Heat center made it official. A spokesman for the Heat said a story erroneously was placed on the team’s web site Monday confirming that Mourning will call it quits. The 37-year-old Mourning, who entered his 15th NBA season saying it would be his last, saw it cut short when he tore the patella tendon and quadriceps tendon in his right knee on December 19.