Federer and Nadal to clash in Indian Wells semi-final

Mar 15, 2019; Indian Wells, CA, USA; Roger Federer (SUI) during his semi final match against Hubert Hurkacz (not pictured) in the BNP Paribas Open at the Indian Wells Tennis Garden. Mandatory Credit: Jayne Kamin-Oncea-USA TODAY Sports

(Reuters) - One of the great sporting rivalries will be renewed at Indian Wells on Saturday when Roger Federer and Rafa Nadal clash in a semi-final at the BNP Paribas Open, providing the Spaniard's troublesome right knee does not keep him off court.

The multiple Grand Slam champions both won their quarter-finals on Friday, although Nadal in particular had to work hard to overcome Russian Karen Khachanov 7-6(2) 7-6(2) in a match during which he required treatment on the knee.