Basel don suffer historic defeat for St. Jakob-Park as Sion beat dem 2-0 for the first time for Super League history.
Rilind Nivokazi open scoring for the 24th minute, converting a counter-attack after Chouaref supply am.
Josias Lukembila double the lead for the 60th minute with a fine left-foot finish from 16 meters.
Moritz Broschinski get chance to reduce deficit from penalty spot for the 75th minute, but Anthony Racioppi save am.
Basel miss Xherdan Shaqiri due to injury and struggle to create clear chances throughout the match.
Sion move to fourth place with this win, overtaking Basel and reducing gap to Lugano to five points.
Basel next face league leaders Thun on Saturday.
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