Marc Marquez beats brother in Argentina MotoGP sprint

Marc Marquez won the battle of the brothers when beating Alex Marquez in the Argentina MotoGP sprint race on Saturday.

The six-time world champion was continuing his dream start to life riding a factory Ducati.

After wins in the sprint and race in the season-opener in Thailand a fortnight ago he will be hot favourite for Sunday's main event at the Termas de Rio Honda circuit.

Marquez has looked imperious at this second leg of the 22-race season, topping the times in practice and nailing pole earlier Saturday with a track record.

And he led the 12-lap dash from start to finish to cement his position at the top of the fledgling riders' title race as he goes in search of a seventh MotoGP crown.

As in Thailand he was followed across the line by Alex, who inherited the elder Marquez's seat on Ducati's satellite Gresini bike.