Diving down the inside at Adelaide, though Laverty calmly retook the position on the exit of the hairpin, Checa's second effort further around the lap at Chateau d'Eau would prove more conclusive.
From here, Checa began to stretch his advantage, safe in the knowledge that – with just 13 riders now circulating – he could even afford to drop to the back of the field and win the title.
Naturally, it wouldn't come to that, Checa easing off in the final laps to ensure that he came across the line as a world champion for the first time in his career, the culmination of an outstanding season that has yielded 13 race wins.
Furthermore, Checa's win represents the second title of the day for Althea Racing following Davide Giugliano's earlier success in the FIM Superstock 1000 race.
Behind him, the battle for second went down to the wire as Laverty faded significantly in the final laps, immersing him into the chasing pack of Haslam – now up to third – Melandri and Camier.
Melandri's race had been an eventful one, the Italian getting 'bullied' early on as he was demoted to a low of ninth, before steadily working his way back into contention.
With Laverty looming ahead, Melandri capitalised on Haslam's hesitance behind the Yamaha to pounce for third, which quickly became second when the three-time race winner surpassed on his team-mate. Nonetheless, Haslam would promptly follow his future team-mate through to get third and notch up his and BMW's first podium finish since Monza.
Laverty's late race troubles would also cost him fourth, with Camier getting past to secure a solid result on the sole Aprilia Alitalia, while Laverty settled for fifth.
Local favourite Guintoli couldn't build on early promise as he completed the race in sixth, ahead of remaining top ten finishes Noriyuki Haga, Joan Lascorz, Troy Corser
and Tom Sykes.
Just thirteen riders would be classified, with BMW Italia's new signing Javier Fores scoring an 11th place, ahead of Michel Fabrizio, who remounted for 12th despite a collision with Sykes. Roberto Rolfo
secured the final points in 13th.