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Alexander Zverev discusses winning his seventh straight match to beat John Isner in the Mutua Madrid Open quarter-finals. Watch live tennis at tennistv.com.

Watch highlights as Dominic Thiem inflicts Rafael Nadal's first loss on clay for the season at the Mutua Madrid Open. Alexander Zverev, Denis Shapovalov and Kevin Anderson also reach the semi-finals. Watch live tennis at tennistv.com. Photo: Getty Images

Alexander Zverev looks to extend his win streak to eight on clay when he meets #NextGenATP Canadian Denis Shapovalov in the Mutua Madrid Open semi-final on Saturday. Watch live tennis at tennistv.com.

As it stands, just one man in the past two clay-court seasons can successfully claim Rafael Nadal is beatable on clay. And on Friday, that man – Austrian fifth seed Dominic Thiem – will earn another shot at a repeat when he meets the World No. 1 in the quarter-finals of the Mutua Madrid Open. View FedEx ATP Head2Head for the following matches & vote for who you think will win!  Nadal vs Thiem | Zverev vs Isner | Edmund vs Shapovalov | Anderson vs Lajovic [GROUP POLL]137[/GROUP POLL]  Nadal has not conceded a set on clay since falling to Thiem in the Rome quarter-finals in 2017 and on Thursday, broke John McEnroe’s 34-year record for most consecutive sets won...

Sixth seeds Juan Sebastian Cabal and Robert Farah needed only 58 minutes to move into the Mutua Madrid Open quarter-finals on Thursday, beating Fabio Fognini and Diego Schwartzman 6-3, 6-3. The Colombian duo will next meet top seeds and defending champions Lukasz Kubot and Marcelo Melo. [ALSO LIKE] Five-time champions Bob Bryan and Mike Bryan, who turned 40 last month, dismissed Damir Dzumhur/Franko Skugor 6-4, 6-3. The Bryans will next face fifth seeds Jamie Murray/Bruno Soares in the quarter-finals. The Bryans will be co-No. 1s in the ATP Doubles Rankings if they win the ATP World Tour Masters 1000 title and Kubot/Melo do not reach the final. The Bryans would become the oldest doubles No. 1s in history. They will be...