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