It was possibly their worst performance ever.

这也许是他们迄今为止最糟糕的表现。

《牛津词典》

"It's the worst performance I have ever seen by a company in one year, " said Walter Loeb, an independent retail consultant.

NPR: JC Penney Posts 4th Straight Big Loss, Sales Drop

Their performance in Istanbul was the worst race I can ever remember them having since the 1980's.

BBC: SPORT | Motorsport | Motorbikes | Steve Parrish's MotoGP column