Key talking points ahead of the Wimbledon men’s semi-finals

Novak Djokovic and Rafael Nadal go head-to-head in Wimbledon’s men’s semi-finals on Friday.

The other last-four match sees two of the tallest players in tennis do battle as 6ft 10in John Isner tackles 6ft 8in Kevin Anderson in a match sure to be dominated by serving.

Here, Press Association Sport looks at the key talking points.

What has Rafa got left in the tank?

Djokovic can show he is back to his best

Is Isner simply unplayable this fortnight?

John McEnroe has tipped Isner to reach the final, having been impressed by his fellow American so far in the championships. Isner has sharpened up his all-round game, and with the improvements bolted to the remarkable serve he possesses, it is hardly a surprise he has improved on his modest previous best Wimbledon performance. It seemed a sure thing that one day he would go beyond the third round, but Isner has been surprised by his success this year. At the age of 33, he has slung down 161 aces in five matches and has yet to drop serve in 95 games.

Anderson needs to break the unbreakable

Finding a chink in Isner’s serve was beyond Milos Raonic in the quarter-finals, so it falls to Anderson to identify and then exploit a weakness. Trouble is, he is struggling to see one. Anderson’s verdict this week was that Isner has “arguably one of the best serves of all time”, and he pointed to the high percentage of first serves that his rival has been landing. He senses Isner’s confidence is rising by the round, giving him added belief in his ground strokes too. Anderson feels he can hold his own from the back of the court, and his own serve is a titanic weapon too, only not quite as fearsome as the Isner missile.