Original instructions:
As with all Baker's Dozens, each post builds a list on topic until it reaches 13 answers. If you post number 13 then begin a new topic. Here it's all about Sports (teams, dynasties, positions, records etc.). Be sure there are 13 answers to be had when creating a new topic!
Last few topics:- Thirteen soccer clubs with a Q in their name
- Thirteen jockeys who have ridden a winner of the Epsom Derby
- Thirteen pro or college sports teams that have removed nicknames relating to indigenous peoples of North America
- Thirteen countries that have won Olympic gold in alpine skiing
Current game: Thirteen sports that originated in the United States1. Basketball
2. Water skiing
3. American football
4. Snowboarding