Jamie Sherwood, 18, organised the event, which took place on Friday, September 25 at Winterton Hall, Plaistow.
The 24-hour tennis event began at 7pm and Jamie and five friends took turns playing a combination of doubles and singles tennis through the night.
Play stopped on Saturday at 7pm when they could finally take a rest.
Jamie’s great-grandmother, Babs, 95, was diagnosed with Alzheimer’s disease six years ago.
Jamie, who is studying A-levels at The Weald sixth form in Billingshurst, said: “My great-grandmother has had Alzheimer’s disease since I was little and it’s a very tough disease.
“Luckily she is still able to live in her own home, but she requires constant care.
“Sadly she doesn’t recognise me any more when I visit her, which is hard as I was very close to her.
“Fortunately she continues to be the same loving and gentle woman she was before this cruel disease took hold, but it’s awful to watch someone you love go through this.
“I decided to support Alzheimer’s Research UK because I want to make a difference so that one day there will be the treatments in place that give people the chance to recover from Alzheimer’s and other dementias.”
For more information, or to help Jamie raise money, visit www.justgiving.com/Jamie-ARUK
Don’t miss out on all the latest breaking news where you live.
Here are four ways you can be sure you’ll be amongst the first to know what’s going on.
1) Make our website your homepage at www.bognor.co.uk/
2) Like our Facebook page at www.facebook.com/BognorRegisObserver
3) Follow us on Twitter @BogObserver
4) Register with us by clicking on ‘sign in’ (top right corner). You can then receive our daily newsletter AND add your point of view to stories that you read here.
And do share with your family and friends - so they don’t miss out!
The Bognor Observer - always the first with your local news.
Be part of it.