Tag with the sport as well as the league. Let's say I'm interested in [tag:cricket] questions, and have that as one of my favourite tags. If we don't tag *all* cricket questions with [tag:cricket], I've got to set all of the following as favourite tags (potentially. I appreciate most of these don't exist at the moment, but they could if we were tagging only with the league):

* [County Championship](https://en.wikipedia.org/wiki/County_Championship)
* [Royal London One-Day Cup](https://en.wikipedia.org/wiki/Royal_London_One-Day_Cup)
* [Natwest t20 Blast](https://en.wikipedia.org/wiki/NatWest_t20_Blast)
* [Sheffield Shield](https://en.wikipedia.org/wiki/Sheffield_Shield)
* [Matador BBQs One-Day Cup](https://en.wikipedia.org/wiki/Australian_domestic_limited-overs_cricket_tournament)
* [Big Bash League](https://en.wikipedia.org/wiki/Big_Bash_League)
* [Ranji Trophy](https://en.wikipedia.org/wiki/Ranji_Trophy)
* [Vijay Hazare Trophy](https://en.wikipedia.org/wiki/Vijay_Hazare_Trophy)
* [Indian Premier League](https://en.wikipedia.org/wiki/Indian_Premier_League)
* At least 3 more leagues in South Africa
* At least 3 more leagues in the West Indies
* At least 3 more leagues in New Zealand
* More leagues in Pakistan, Sri Lanka, Bangladesh and Zimbabwe.
* Any number of women's leagues
* Any number of leagues in the non-Test playing countries.
* Any number of lower level leagues.

The same problem exists for other sports: how many soccer competitions are there?