Sentence:  Remarkably United's 10 men almost salvaged an improbable draw during a late, spirited challenge. They showed great competitive courage in that period and there were chances for Robin van Persie, Ángel Di María and Marouane Fellaini to punish City for defending too deeply and not being more <WSD>clinical</WSD> with their opportunities at the other end. 
Meaning of the word marked with <WSD> tags:  Cool and emotionless.