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Jerzy JanowiczWimbledon semifinalist Jerzy Janowicz has pulled out of the Poland team for this month's Hopman Cup with a foot injury. (Click here for more on tennis news)

Janowicz was to team with women's No.5 Agnieszka Radwanska at the annual international mixed team tournament in Perth, Australia, which serves as a warm-up for January's Australian Open. He will be replaced in the draw by Davis Cup teammate Grzegorz Panfil. (Also read: Bopanna confident of good start to season)

Janowicz said he injured his foot a couple of weeks ago and was hoping to be fit in time to play. "Poland will be making its debut at the event and I wish Agnieszka the best of luck."

John Isner, Sloane Stephens, Jo-Wilfried Tsonga, Petra Kvitova, Sam Stosur and Bernard Tomic are among the field for this year's tournament from December 28 to January 4.