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

American Danielle Collins completed a comprehensive straight-set victory over defending champion Iga Swiatek in the third round of the Italian Open.