FYI, Shevchenko lost to Nunes by unanimous decision back in March -- but Valentina says she's at the top of her game now ... and is champing at the bit to get the current UFC women's bantamweight champion back in the Octagon.
"I know it will be a very difficult fight for her," Shevchenko said ... "I want it. I want it very much."
She also pitches her case to UFC honcho Dana White about why she should get the rematch.
There's more ... we also asked about a possible matchup with Ronda -- Valentina makes it clear, she ain't scared of ANYONE!
UFC honcho Dana White took the stage Tuesday evening at the Republican National Convention and praised Donald Trump as a loyal friend who's had his back since day 1.
White opened his speech by saying "I'm sure most of you are wondering, 'What are you doing here?'" -- but went on to explain how Donald was the first person to support UFC when White and his partners bought the business in 2001.
Long story short, White says Trump is the kind of fighter America needs ... and has all the tools to be a kickass president.
White appeared on the "TMZ Sports" TV show a while back and explained why he's Team Trump for life.
Brock Lesnar may have caught a break -- because despite the fact he allegedly tested dirty TWICE, he'll only face punishment for one violation ... sources familiar with the situation tell TMZ Sports.
It all has to do with the dates Brock's samples were collected ... and when he was notified about the results.
In Brock's case -- he was tested on June 28th and July 9th. But he wasn't notified that his June test came back dirty until July 14th ... 5 days after his second test.
Our sources tell us ... because he wasn't notified until after the second sample was collected, he will only be punished for one violation.
The punishment for a first time banned substance user can range from a warning to a 2 year suspension ... though it can be raised to 4 years if the infraction is determined to be an "aggravating circumstance."
A second violation would carry even harsher penalties ... but Brock won't have to worry about that.
Brock Lesnar tested positive for a banned substance on the DAY OF UFC 200 ... this according to the UFC.
The U.S. Anti-Doping Agency notified the UFC that a sample collected on July 9th tested positive for the same substance that was found in Brock's 1st failed test, which went down on June 28th.
"It is important to note that, under the UFC Anti-Doping Policy, there is a full fair legal review process that is afforded to all athletes before any sanctions are imposed," the UFC said in a statement.
Our sources tell us ... "Big Country" was added to the cast after Paige VanZant dropped out due to a training conflict and to prepare for her upcoming fight ... and they were blown away by Nelson's acting skills.
In fact, we're told director Dimitri Logothetis initially only had Nelson slated for a minor scene in Nevada ... but he was so good, producers expanded his role ... and he's currently filming a scene in Thailand!
We're told Nelson plays a prisoner who's training for some kind of death match. He joins a cast stacked with real life athletes including Mike Tyson, Georges St-Pierre, Fabricio Werdum and Ronaldinho.
By the way, Nelson fought in Vegas on July 7th -- and was hit so hard in the face he lost a tooth!!!