American Danielle Collins upset world No. 2 Iga Świątek, who has dominated the Italian Open recently, winning it three of the last four years as she has been almost invincible on clay.

ROME — Iga Świątek ’s struggles continue, at one of the last places anyone in tennis would have expected. Świątek, a master of clay-court tennis and defending champion at the Italian Open, lost to American Danielle Collins in the second round, falling 6-1, 7-5.

It is strange to see a five-time grand slam champion struggle not with her game but with her mentality on the court