If you’re a big tennis fan, then you may have heard of the Hopman Cup that takes place in Perth, Australia every December or January. At this year’s championship, beloved local Aussie Lleyton Hewitt was in a match against America’s Jack Sock.

Just after Lleyton made a serve that was called out, Jack believes it’s in and encourages Lleyton to challenge the call. Lleyton is shocked, and the crowd is shocked, and the whole spectacle is a funny and memorable affair that reminds us to be true to ourselves and the sport. It also speaks to Jack’s character and proves once again that sportsmanship is not dead.