Brisbane whiz kid Reece Walsh won the battle of the fullbacks with Latrell Mitchell in a 28-18 win over an error-riddled South Sydney.

Walsh scored two tries at Suncorp Stadium in front of 35,507 fans on Thursday night, the second after a Mitchell blunder when he failed to gather an in-field kick by Broncos winger Jesse Arthars.

Broncos skipper Adam Reynolds battled through a recurrence of a right knee injury before leaving the field in the 70th minute.

Apart from a six-minute spurt after half-time where bench utility Siliva Havili scored a try and set one up, the Rabbitohs were diabolical.

The Broncos led 12-0 at the break after both sides bumbled and fumbled their way through 40 excruciating minutes for their respective coaches.

The Rabbitohs were the worst offenders, completing just 10 of 20 sets.

They made a laundry list of elementary errors, including losing a scrum when they had the feed.

After the Havili heroics they went back to their first-half ways.

Walsh and centres Selwyn Cobbo and Kotoni Staggs razzled and dazzled after Broncos forward leaders Pat Carrigan and Payne Haas dominated.

Two pieces of brilliance by Reynolds and Walsh lit up the half.