Marquez on pole in Argentina by hefty margin

The Honda rider lapped the Termas de Rio Hondo track more than half a second faster than closest rival Aleix Espargaro on a Suzuki.

(Reuters)

Ducati's Italian Andrea Iannone completed the front row on a disappointing day for Yamaha, whose championship leader Valentino Rossi qualified only eighth.

Rossi leads Ducati's Andrea Dovizioso by a single point in the standings after two races, with Marquez a further four behind.

(Reporting by Alan Baldwin, editing by Mark Meadows)