Three weeks after the Chicago tournament, Ali participated in a "USA vs. China and Kazakhstan" exhibition event held in Zunyi.

Ali's doping test at the exhibition returned positive for Cathine, a banned stimulant found in the illegal Yemeni drug Khat.

However, he maintained his innocence and appealed to the International Boxing Association ("AIBA") to overturn the test results, Ali hired an attorney to challenge the findings and allegations.

Ali argues he had taken Cathine inadvertently after contracting a cold in China, but widespread use of stimulant drug Khat is known among the Yemeni American community.

In February 2008, Ali agreed to drop his challenges in exchange for a three-month ban retroactive to the date on which he had originally accepted his voluntary suspension.

[9] On August 11, 2008, Ali was outboxed at the Olympic Games in his opening match, losing by decision to Georgian Popescu of Romania, by a score of 20-5.

[10] Ali recorded a third round stoppage of Julias Edmunds in his first live televised fight on ESPN on July 16, 2010, at The Prudential Center in Newark, New Jersey.

He returned to The Prudential Center on August 21, 2010, in his second televised bout and knocked out Lenin Arroyo on the undercard to Tomas Adamek versus Michael Grant.

On December, 9th to finish the year Ali on his 2nd PPV event fought to a unanimous decision against Manuel Guzman to record his 11th win.

On April 9, in his 3rd PPV televised bout Ali knocked out Javier Pérez in the 3rd Round On the Tomas Ademek undercard.

Ali dropped him with an uppercut and was smashing him until a three-punch combination to the head badly staggered him again, forcing referee Lindsey Paige to stop the fight at 2 minutes, 18 seconds.

"[13] Ali took a step up in class to fight Californian volume puncher Jessie Vargas in March 2016 for the WBO welterweight title left vacant by Timothy Bradley.

Vargas landed a brutal body shot followed by a right to the head to knock Ali out on his feet and win the vacant WBO world title.

[15] Since losing to Vargas, Ali won two fights and on July 29 headlined a Goldenboy event against Venezuelan former WBA interim champion Johan Perez.

"I can't wait to get back in the ring and demonstrate the speed and power that has led me to be a top contender in the welterweight division.

I have been training since I was 8 years old, and I am glad I got this win at MSG, in my hometown.” Cotto came in as the favorite in the bout, but Ali showed he was up to the task early in the fight as he staggered the rugged legend with a hard right hand.