Mind-boggling brainteaser that only real Wimbledon fans can work out in 9 seconds

Only the most eagle-eyed tennis fans will be able to crack this brainteaser in less than 10 seconds.

To mark the first day of Wimbledon - nothing less than the UK tennis event of the year - challenge yourself with this tricky brainteaser and test out just how good your eyesight and attention to detail really is - and you can even up the ante a little further by sharing this one with your group chats and see who managed to solve it quickest.

This brainteaser challenges you to find the tennis ball hidden away amongst rows of different fruits. For the most part, you are presented with apples, which are a similar colour to the tennis ball, adding to the confusion for your eyes and brain, and also littered in the image are other fruits like strawberries, kiwis, watermelon, and oranges.

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Take a look below and see if you can find the lonely tennis ball in nine seconds or less.

Brainteasers like this one aren't just a bit of fun, they can also help improve your attention to detail, memory, problem-solving skills and even keep some of the adverse impacts of aging at bay. Doing a daily puzzle or challenge like this one can literally make you happier and healthier - and also massively improve your motivation levels, as each time you solve one you get a sweet dopamine hit that reminds you just how good it feels to challenge yourself.

This brainteaser is a kind of optical illusion too, using the similarity of colours and repeating patterns to confuse the messages sent between your eyes and your brain.

To overcome this confusion, you have to really concentrate on exactly what you see in front of you - and not skip over any detail. By really looking at the image, you will be able to overpower the assumptions your brain is making about what it thinks it is seeing.

Human beings rely on thousands of assumptions every day - this is because what our eyes are seeing has to be taken in, sent to the brain, and then processed, all in a matter of milliseconds.

This creates a kind of lag, so what we are consciously seeing and what is in front of us is actually fractionally delayed. To safely operate through this lag time, our brain relies on assumptions based on our previous experiences to keep us safe - and this is where brainteasers and optical illusions trip us up.

It's quicker for our brains to assume all the little round green things are apples, as the image is repeated so many times, but if you pay close attention the tennis ball is hiding there in plain sight.

If you think you have the answer, keep reading to see whether you were correct, but if you are still searching for the tennis ball, here is a little clue: scroll back up and take a good look at the bottom right quadrant of the image.

Did you manage to find the tennis ball and, crucially, were you faster than your friends? If you solved this one in nine seconds or less, give yourself a pat on the back and declare yourself the world's biggest tennis fan. Took you a little longer? Keep practicing with the Mirror's extensive games and teasers.

Let us know in the comments how quickly you found the tennis ball.