Few would disagree with Murray's assessment.
At 1-all in the fifth, del Potro jumped to his right, rolling along the turf and losing his racket, for a volley victor, and then celebrated by raising both arms. They hugged, and walked towards the umpire's chair together, their arms around each other.
"I didn't think he could play at such a high level for so long". I wanted to stay there for all night long. "It's a big chance for me to face Rafa tomorrow".
The fourth-round match resumed on Tuesday afternoon after bad light had stopped play on Monday with the Argentinian leading by two sets to one. Del Potro saved the first two on his own serve.
Which TV channels will broadcast the Wimbledon 2018 Novak Djokovic vs Rafael Nadal semi-final match? Suddenly it was 6-6 at the change-of-ends.
Isner leads Kevin Anderson 6-7 (6), 7-6 (5), 7-6 (9) in their semifinal on Centre Court. He had just lost a 71-minute second-set during which he felt he was the better player. He lost in straight sets - with a tie-break, of course.
But you also have to work very hard, and Nadal has that quality in spades.
In a match between two of the game's biggest servers, Anderson started the match with a double-fault. That's how it is.
"Then the match changed".
What followed was a battle for the ages.
John Isner celebrates winning his quarter-final against Milos Raonic.
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Curren was watching that match closely, and he says that it was Anderson's mental strength that stood out most for him.
"I've been building the last couple of weeks on the level of tennis that I've played the last couple of month, the last couple of clay-court tournaments and Queen's".
"He must view the semi-final as a normal match and treat it as if it was a first round match".
Isner called for a trainer to have his right index finger treated at 2-1 but didn't seem bothered by any problem when play resumed. "That's very amusing", said a chuckling Murray. Del Potro pulled off some diving volleys that sent the crowd gasping, and he is particularly proud of one of those shots.
Another alternative to watch Wimbledon matches featuring Nadal live and free is to try out the FuboTV 7-day free trial which means you can check it out without any obligation to buy.
Nadal broke for 3-2 but had to save break points in the sixth and eighth games before securing a memorable victory. After losing the first set, Djokovic went on to take the next two sets.
"The crowd at the end was incredible".
It feels like a long time coming, too.
World No 1 Nadal, the 2008 and 2010 champion at the All England Club, trails Djokovic, the 2011, 2014 and 2015 victor, 26-25 in a rivalry which began at Roland Garros 12 years ago.
Will Nadal do anything special to recover from this near-five-hour bout with Del Potro? You have to accept that if you want to win important things.
It's going to be the usual for the 32-year-old - an ice bath and lots of work with his physio.
Djokovic had three match points but could not capitalise and Nadal won the match 3-6, 7-6, 7-6. "That's a big thing". We played each other in college probably three, four, five times.