The only goal of this tense game was scored by Hicham Boussefiane (58th minute).
Last Thursday, WAC had clinched their ticket to the semis after defeating Nigeria’s Enyimba FC 3-0, in the quarter-final second leg, confirming its 1-0 win in the first leg game.
ES Tunis advanced to the semis after beating Congolese TP Mazembé 3-0, last Thursday in Tunis, overcoming their first leg defeat (1-0) in Dar Es Salem (Tanzania).
The two teams will play the second-leg game on November 1 at the Hammadi Agrebi stadium in Tunis.
In the other semi-final first leg, played earlier in the day, the South Africans of Mamelodi Sundowns bested Egypt’s Al Ahly 1-0, at the Loftus Versfeld Stadium in Pretoria.