Aussie super welterweight Tim Tszyu has fallen short in his quest to reclaim his world title from towering American Sebastian Fundora after failing to come out for the eighth round.

Sebastian Fundora retained his WBC super welterweight title when Tim Tszyu was unable to answer the bell in Round 8, putting a definitive end to an all-action return bout Saturday night.

It took little time for Fundora to send a message to Tszyu, landing a thudding left in the first round that dropped Tszyu to the canvas. Tszyu beat the count, but it took several rounds before it appeared he'd shaken off the knockdown and was fully back in the fight.