Maria Sharapova launched her exhibition comeback at World TeamTennis' Smash Hits in Las Vegas Monday night.

Sharapova received the support of a pair of Grand Slam champions in Shanghai.

Watch: Maria Sharapova Rips ITF, ITF Strikes Back

Both world No. 1 Novak Djokovic and 2009 US Open champion Juan Martin del Potro wished the 29-year-old Russian well in her comeback.

Reiterating remarks he made at Indian Wells earlier this season, Djokovic praised Sharapova, his fellow Head endorser, for handling herself "with dignity" following her two-year doping ban after testing positive for the banned substance meldonium. Sharapova won a partial appeal of her suspension, which was reduced to 15 months.

"You know, from my opinion, I see that it was no intention in doing that, because the rules changed this year, but it was an error and mistake that she and her team, you know, in a way had to take the consequences and pay for and the suspension is there rightly so," Djokovic said. "And she, I think, was, in a way, courageous enough to come out and admit before anything was heard of this case.

"So in that way, I thought she handled herself with the dignity, which is for praise, but I think she’s also aware of the mistake. So then the rules are there to be followed."