Heather Watson out of Rogers Cup after injuring shoulder

Heather Watson is out of the Rogers Cup in Toronto after being forced to retire due to a shoulder injury in her first-round match against Naomi Osaka.

The British No 2 was on the way to a resounding defeat, trailing 6-1 4-1 to the Japanese teenager, when she decided to call it a day.

Watson, who came through two rounds of qualifying to compete, received treatment in the second set and could not see the contest out.

The writing was on the wall from the opening game, which Osaka broke before she raced into a 5-0 lead.

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Watson avoided a whitewash by breaking Osaka's serve but could not hold on to her own service game and her opponent duly claimed the first set.

The second set followed a similar pattern, Osaka breaking early, and when Watson knew there was no way back in the contest, she took the option to retire.