Why did the tennis player bring extra string to the match?

To keep her racket in check.

Did You Know?

"Racket" sounds like "racket" as in chaos or scheme, but also the tennis equipment — so keeping her racket "in check" plays on both meanings. Fun fact: modern tennis racket strings are often made of synthetic gut or polyester, restrung after just a few matches by pros since tension loosens with every hit.