Marquez crashes twice in bruising day of practice at Dutch Grand Prix

Ducati's MotoGP championship leader Marc Marquez crashed twice on a painful day of practice at the Dutch Grand Prix in Assen on Friday, with the Spaniard saying he was lucky to walk away with no major injuries ahead of the weekend's action.

Marquez, who has not won at Assen in seven years, arrives at the Cathedral of Speed with a 40-point lead but as he put the Ducati through its paces, he struggled on the sweeping turns when the medium front tyre failed to grip in cool conditions.

The first crash saw Marquez go down in a highside crash and as he ended up in the gravel, he quickly took off his left glove in apparent pain.

On the second crash, Marquez lost his balance on a turn and slid into the gravel again, this time stomach down as the bike tumbled away from him.

The 32-year-old initially stood up but appeared winded and quickly sat on his haunches holding his groin before he was helped off the track by marshalls.

"It's not an easy day for my body but apart from that I'm lucky because nothing important - some things, yes - but it's not something that will be a problem for the next two days. Tomorrow I will check when I get up," Marquez said with a smile.

"The first one (crash) was a bit strange because I was not really pushing but it felt super slippery. The second one was a consequence, it was a time attack but I did the time attack with the front tyre that I crashed this morning."

Marquez also sported a small cut on his chin after his slide across the gravel and the Ducati rider said the size of the stones did not help as he also hurt his stomach.

"The rocks are super big and then when you arrive there with that high speed, it hits your body," he added.

"I had a problem and then I was breathing (hard) there on the gravel