Question: What Swiss football club based in Basel did Thomas Häberli join in July 2000?
Sentence (from "2013–14 FC Basel season"): Their 2013–14 Swiss Super League season began on 13 July with the home tie against FC Aarau and after the first six rounds they occupied just the fourth position in the league table, six points behind the leader Young Boys Bern.
Relevant evidence: No