Jorge Lorenzo is second in the championship standings, 14 points behind Valentino Rossi.
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Jorge Lorenzo suffered a sprained shoulder in a mini bike accident on Saturday.
Despite the injury, Lorenzo will still race in the Japanese Grand Prix at Twin Ring Motegi on Sunday.
The injury for the 28-year-old Spanish rider comes at a critical moment, as he finds himself 14 points behind Yamaha teammate Valentino Rossi in the world championship standings, with four races left in the 2015 season.
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Lorenzo has six wins, compared to Rossi’s four victories so far this season.
Rossi does have two second-place and seven third-place finishes on the year, while Lorenzo has only recorded one second-place and one third-place finish.
Marc Marquez is third in the standings, 79 points behind Rossi.