"Luckily, I had a little bit more pace than Marc and won this very important victory because now I'm leading the championship with Valentino," Lorenzo told reporters after his fifth victory of the season.
Lorenzo, the 2010 and 2012 world champion, is level in the overall standings on 211 points with team mate Rossi, 52 points ahead of Honda's Marquez, the 2014 champion.
(Reporting by Ed Osmond in London, editing by Pritha Sarkar)