Sorry to Juan Martin, he's an wonderful opponent and incredible player.
Del Potro was straining to stay in touch in almost every point, and his gambling instincts drove him to explore the white lines.
As he served out to reach his sixth semi-final, his old sparring partner, Andy Murray, newly installed in the BBC commentary box, declared the quality of tennis in the fifth set "the best I've seen in the tournament so far". Del Potro broke and served for the set at 5-4, but double-faulted and Nadal clinched the break-back with a rasping forehand down the line.
For Del Potro, who dived, tumbled and slipped as he tried to contain the two-time Wimbledon champion it was an 11th defeat in 16 meetings with the Spaniard.
"In the last set there was a little of everything, great points, great rallies, he was hitting insane with his forehands". He picked himself up and dusted himself down to play on for another eight games, but it was a different story an hour later when there was nothing left to fight for.
Just 90 minutes after defending champion Roger Federer was sensationally knocked out by South African Kevin Anderson, it seemed as if the grasscourt major would lose its top two seeds on the same day as Del Potro took a two-sets-to-one lead. It also meant the "King of Clay" was one game away from taking the set.
Nadal needed four hours and 48 minutes to win his first quarter-final at Wimbledon since 2011 when he beat Mardy Fish in four sets.
Nadal wasted a fourth chance at 7-6, before letting 2009 U.S. Open champion del Potro grab three points in a row for that set.
Del Potro put both hands on his head.
The crowd were on their feet when Del Potro took off to end a magnificent point with a diving volley in a marathon third game, yet Nadal got the break with a sublime cross-court victor in the next service game.
That blip was enough for Nadal, chasing an 18th Grand Slam title, to surrender his first set of the championships.
Then Del Porto managed to hold serve to love, forcing Nadal to serve out the match, which he did, winning it 6-4 to reach his sixth semi-final. Only negative thing is I played nearly five hours, and I had the chance maybe to play less winning that second set.