Sentence:  In truth, Tottenham never really looked like taking all three points and this defeat means they face a battle to reach the knockout stages -with their next home game against PAOK Salonika on 30 November likely to prove <WSD>decisive</WSD>. 
Meaning of the word marked with <WSD> tags:  Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.