Possible Clues:

• Not defeated
• Without a single defeat
• Engineer consumed by butane explosion is not the first to not have found a match
• A French cookery writer reportedly never surpassed
• Not taken down, leader in battle held — to be so?
• Not having lost a match
• Never having experienced loss, like a spoilt child?
• A French one might be a Latin X - none better
• Best of all, not much used, as paths go
• Never lost nor chastised