Former world number one Caroline Wozniacki was unable to complete a first-round match for the second successive week due to a new injury.

Wozniacki suffers another injury setback in Rome

Caroline Wozniacki retired from the Internazionali d'Italia after suffering another injury setback during her first-round match against Danielle Collins.

Wozniacki was unable to complete her opening encounter with Alize Cornet at the Madrid Open last week due to a back injury.

The luckless former world number one made another early exit in Rome on Tuesday due to an issue with her calf.

Wozniacki, the 11th seed at the Foro Italico, decided she could not carry on after Collins won the first set 7-6 (7-5).

The 2018 Australian Open winner called for the physio three times before shaking hands when Collins took the opening set.

Dane Wozniacki was beaten by Madison Keys in her first final of the year in Charleston last month.

The 28-year-old revealed she had struggled with a viral illness for almost two months after withdrawing from the Dubai Tennis Championships in February, having been diagnosed with rheumatoid arthritis last year.

Jaziri wins again in Dubai

Jaziri shines on despite floodlight failure in Dubai

Following his upset win against Grigor Dimitrov, Malek Jaziri marched on at the Dubai Tennis Championships on Wednesday.

Stephens survives in Acapulco

Stephens survives in Acapulco, Tsurenko eases through to quarters

US Open champion Sloane Stephens advanced in Acapulco thanks to Wednesday's 5-7 7-6 (8-6) 6-0 victory over Dutch qualifier Arantxa Rus.

Del Potro outlasts Ferrer

Del Potro outlasts Ferrer as Zverev and Thiem advance

Juan Martin del Potro made it through to the last eight by outlasting Spanish veteran David Ferrer 6-4 4-6 6-3 in Acapulco on Wednesday.

Wawrinka ends hard-court season

Wawrinka to miss Indian Wells and Miami Open

Stan Wawrinka feels he would be better off on the practice courts rather than playing at Indian Wells or in Miami.

Pouille outlasts Sugita in Dubai

Pouille outlasts Sugita in Dubai

Yuichi Sugita did not have the staying power as Lucas Pouille reached the Dubai Tennis Championships semi-finals.