Pegula stuns Swiatek, U.S. leads Poland 2-0 in United Cup semifinals… via @WTA https://t.co/JY5FS5qmmf

Have you noticed, @WTA, how UEs are such an important concept to understanding the outcome of a match that the phrase has been widely adopted in completely unrelated fields? You know, like, “Kevin McCarthy made a massive unforced error by subjecting himself to 14 losing votes.” https://t.co/DeRce4VpLS