DAILY MIX: Venus, Juan Martin del Potro face challenges in Miami

KEY BISCAYNE, Fla.— Indian Wells finalist Roger Federer is out of the Miami Open, but the champion, Juan Martin del Potro, remains. He faces a familiar opponent on Sunday in Kei Nishikori.

Both Del Potro and Nishikori have had their fair share of injury struggles with Nishikori most recently dealing with a wrist injury that's knocked him out of the Top 30. Del Potro, though healthy, is dealing with fatigue after 12 straight wins.

Nina Pantic takes a look at Del Potro vs. Nishikori, as well as Venus Williams' open draw:

On the women's side, Venus Williams sits in a fairly wide-open section of the draw after world No. 2 Caroline Wozniacki's loss to Monica Puig. The No. 8 seed danced her way through a tricky opening round, and takes on Kiki Bertens (who her sister Serena beat in Indian Wells).

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