A dominant third-quarter showing by the visiting Miami Heat ended the Charlotte Hornets’ chances of a back-to-back sweep, leading instead to a 121-111 home loss on Sunday night at Spectrum Center. PJ Washington paced the hosts with 21 points on 9-of-13 shooting, six rebounds and three steals in the loss. The second-year Kentucky product has now scored 20 points in five of his last nine outings after doing so just once in his previous 17 appearances since the All-Star Break. Miami led by seven at the break and after a quick 5-0 Charlotte run to open the third, the visitors then responded with a 14-5 stretch to go up by double digits at the 7:37 mark. Defensive mistakes and foul trouble by the Hornets caused the Heat’s advantage to eventually balloon to 20 heading into the fourth. Charlotte never threatened the outcome again, coming up short in pulling off its first season series sweep of Miami since 2001-02.