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Is this in or out? Close line call divides tennis world

Is this in or out? Close line call divides tennis world

American tennis player John Isner has caused a stir on social media with a photo that's dividing opinion.

Isner had a practice session with Tim Smyczek on Tuesday and the pair couldn't agree on a ball mark for a line call.

So Isner took a photo and put it to his Twitter followers:

Andy Roddick led those who thought it was out:

However there were many who thought it caught the line and was in:

Overall the majority went with out, but Isner ended up giving the point to his opponent.

Isner's antics come one day after a similar incident divided the cricket world.