Jamie Leigh Fewkes was found guilty by jury on one count of aggravated burglary and two counts of assault for the 2017 attack. 

Fewkes was sentenced to 15 months' jail, with a three month suspended sentence and a non-parole period of six months.

Supreme Court Chief Justice Alan Blow said he gave Fewkes a more lenient sentence because of his efforts to curb his alcoholism, having been sober since October last year, and because he "already had a taste of prison" on a different charge.

Chief Justice Blow told the court Fewkes had expressed through his lawyer he was sorry for what happened to the victim. 

Chief Justice Blow said Fewkes entered the victim's home with the intention of assaulting him.

Fewkes struck the victim a number of times with the baseball bat before dropping the bat and assaulting the victim by punching him a number of times to the head. 

"This was a cowardly attack," Chief Justice Blow told Fewkes. 

"You were armed and the other man wasn't.

"You fortunately didn't break any bones." 

Fewkes's victim, a young university student, sustained two chipped teeth, two black eyes, multiple bruises on his head and body, a nose injury and minor lacerations as the result of the attack.

"His psychological problems were made worse by it," Chief Justice Blow said.

"The evidence didn't disclose any sensible motive for this attack.

"It seemed to be a senseless attack as well as a cowardly and vicious one."