In a sport where fighters are normally scowling, annoyed, acrimonious, and straight-up pissed off, Keith Thurman, by and large, is one of the happier ones.

His buoyant attitude, however, is being tested. With the 36-year-old set to return to the ring against Brock Jarvis this coming Wednesday, he’s sat back and listened to what his opponent has said about him.

At the age of 27 and physically in his prime, Jarvis (22-1, 20 KOs) has pointed to his watch and repeatedly told Thurman that his time is up. In part, Thurman has to look in a mirror. He’s been unable to stay healthy for long stretches, resulting in just two fights over the last six years.

Trash talk doesn’t get under Thurman’s skin for the most part but listening to Jarvis has him irate. From his point of view, Jarvis has no right and no credentials to question him.

“I’m really tired of that smug look on his face,” said Thurman to a group of reporters. “He thinks he's done something. I don't care how long I’ve been out of the sport, he’s never touched one of my accolades in the sport of boxing.”

Those titles that Thurman (30-1, 22 KOs) alludes to could use a good dusting. It’s been nearly a decade since the former unified champ was an official belt holder. In the minds of many, Thurman isn’t close to the fighter he once was. Of course, he isn’t in agreement with that assessment but let’s play devil’s advocate for a second.

If Thurman is truly finished, then Jarvis should be a live dog. However, even if he's lost a step or two, or even three, Thurman refuses to have another L placed on his record at the hands of Jarvis.

“At the end of the day, this is boxing," continued Thurman. "He’s going to have to show me what he really brings to the ring. I’m going to show my world-class skills.”