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Ashton Agar suffered a laceration to the bridge of his nose in Western Australia’s Marsh One-Day Cup clash against South Australia on Sunday after dropping a catch hit by his own brother at Karen Rolton Oval.

Rated as one of the better fielders in the country, Agar ran around to attempt a straightforward catch off his younger sibling Wes at mid-on but slipped and copped the ball right between his eyes.

With blood on Agar’s face, teammate Jhye Richardson signaled for medical assistance as Wes Agar immediately ran over to check on his brother's well-being.

Little brother triumphs in Agar v Agar duel

The force of the blow had knocked his hat and sunglasses of his head but after receiving some treatment on the field, the elder Agar was able to leave the field holding a rag to his head.

Wes Agar admitted the incident shook him but was heartened after speaking to his brother post-match.

Agar walks off the field after copping a blow to the head // AAP

"He slipped over and the ball hit his glasses and the glasses split him open," said the 22-year-old fast bowler.

"The doctor wanted to stitch him up, but he just got engaged so he said he'll leave it to a plastic surgeon.

"I was pretty rattled ... It looked really bad. I was just worrying about his health. I wasn't thinking about anything else, I just ran out of my crease to go see him.

"I didn't feel great, but thankfully he's okay."

QUICK SINGLE WA book final spot despite Ferguson epic

Ashton did not play any further part in the match, which Western Australia won by six runs despite a thrilling century from Callum Ferguson.

Wes, who was stumped the over after Ashton dropped him to leave the Redbacks' 9-190 chasing WA's 252, earlier dismissed his brother to complete a five-wicket haul.

WA prevail despite Ferguson's stunning century

"It's always nice to get your brother out," he said. "I played against him once (before) but only bowled about two balls to him.

"To get the five and him on the fifth (wicket), I'm not going to lie, it was pretty special."