NEW YORK — Under normal circumstances, Karolina Pliskova would not have been seeded No. 1 at the U.S. Open and so, while a second-round loss certainly would have been disappointing to her, and noticed by others, it wouldn’t have been as newsworthy.

Pliskova, the 2016 runner-up at the U.S. Open, made her mood clear during a 6-1, 7-6 (2) loss to 50th-ranked Caroline Garcia on Tuesday by breaking a racket.