Below Par Meaning

(of a financial instrument) Having a price below its face value

Example: 2013, Daniel Taylor, Rickie Lambert's debut goal gives England victory over Scotland (in The Guardian, 14 August 2013)[1]
  Steve Gerrard, unusually, had a below-par night, too, even if it was a lovely delivery to set up Welbeck to make it 2-2 with a glancing header.