What is the fine-grained topic of the following text: Wiggins has already won numerous top honours in the World Track Championships and taken three golds, a silver and two bronzes in the Olympics, but although he has taken three silver medals in the Commonwealth Games, all of them on the track and the earliest back in 1998, he has never won gold. Only return the topic.
Wiggins' performance in the World Track Championships, Olympics, and Commonwealth Games.