Winning a major championship is difficult. Successfully defending it, even more so.
In fact, only 14 times since the end of the Second World War has a male golfer managed to mount a winning defence of their major title.
Question is, can you name them all?
You've got 10 minutes to get as many as you can and, to make life a little easier, we've given you the major championship that they've defended.
Good luck - and remember to challenge your friends on social media and leave your score in our Comments section below.