American Marconi Wireless News - Di Giannantonio wins Catalan MotoGP Grand Prix, Alex Marquez injured in horror crash

The race was red-flagged twice, the first time after Pedro Acosta's bike cut out and Marquez made contact with him, with his Ducati-Gresini destroyed in a horrific crash.

On the first corner after the restart French rider Johann Zarco crashed and the race was red flagged again, and restarted with 12 laps remaining.

Acosta started on pole and was out in front until Di Giannantonio snatched the lead with two laps remaining.

Joan Mir and Fermin Aldeguer also edged ahead of Acosta, who then came to grief shortly before the end after colliding with Ai Ogura.

Race organisers said Mir, who finished second, and several other riders are under investigation for tyre pressure regulations.

Fermin Aldeguer completed the podium. Overall leader Marco Bezzecchi struggled all weekend but was able to extend his advantage after his closest contender Jorge Martin suffered his fifth crash of the weekend.

Raul Fernandez took out Martin after trying an aggressive move down the inside, leaving Bezzecchi, who finished sixth, 13 points ahead.

O.M.Souza--AMWN