GB sprinter Adam Gemili has said that he's 'gutted' after missing out on medal in the men's 200m final by a matter of milliseconds. But he's not the first to be so near and yet so far...
This picture must be painful for Adam Gemili to look at. You can see him and France's Christophe Lemaitre crossing the line at what looks like the same time. But Gemili (at the back) was three thousandths of a second behind his opponent (second from front). That's only as much time as it takes for a housefly to flap its wings once, but it was enough to cost him a medal. Bad luck Adam!
Carrie Steinseifer (left) and Nancy Hogshead (right) looked delighted to find out that they'd tied in first place in the 100m freestyle in the 1984 Los Angeles Olympics. The two American swimmers were teammates and lived together, and they were more than happy to share the gold.
Michael Phelps is an Olympic legend; the most decorated Olympic athlete of all time, with a total of 28 medals. But he nearly missed out on his eighth medal. This was the incredible moment when Phelps (left) and his opponent Milorad Cavic both reached for the wall in the 100m Butterfly Final at Beijing in 2008. Phelps was just one hundredth of a second ahead of Cavic, and some disagreed with the result, but photos confirmed Phelps's victory.
Can you tell who's winning here? London 2012 saw the closest finish in Olympic Triathlon history. After swimming 1,500m, cycling 43km, and running 10km, Lisa Norden (left) and Nicola Spirig (right) still managed to cross the finish line neck-a-neck. They both got a time of 1:59:50:00, but Spirig was awarded the win. She'd hit the ribbon just a tiny bit before Norden, so Norden had to settle for silver.
It took a photo to separate defending champion Mahe Drysdale (furthest back) from New Zealand from his Croatian rival Damir Martin (front) in the men's single sculls at Rio. Both men crossed the line at six minutes 41.34 seconds, so at first, the result was called a dead heat. But a photo later showed Drysdale just ahead.
But even now some results really are too close to call. In the 100m Butterfly at Rio this year, Phelps ended up sharing second place with not one, but two other swimmers! Phelps (left), Chad le Clos (middle) and Laszlo Cseh (right) all completed the race in 51.14 seconds, beaten only by Joseph Schooling of Singapore (far right) who was 0.75 seconds faster.
Shaunae Miller was determined to make sure the same didn't happen to her in the 400m final in Rio. She dived across the finish line when it looked like Allyson Felix was about to beat her, snatching the gold from Felix.