In Champions League T-20 Cricket Tournament in Group-B fixtures, Highveld Lions will clash with Sydney Sixers at 5 (IST) , while Mumbai Indians will take on Yorkshire at 9 this evening. Both matches will be played at Newlands in Cape Town . With Mumbai Indians and Yorkshire suffering defeats in their opening Group B matches, today's tie is a must-win game for both the sides to keep their semifinal chances alive.Earlier, Kolkata Knight Riders were knocked out of the tournament, after their must-win Group-A match against Perth Scorchers was called off due to rain in Durban, South Africa last night.In the other Group-A match, Titans defeated Auckland Aces by 59 runs at the same venue.