Juan Martin del Potro recovered from an early injury scare to beat David Ferrer in straight sets in the Wimbledon quarter-finals.
The Argentinian suffered a nasty looking fall during the first game of the match and required lengthy treatment, before playing on to reach his first Wimbledon semi-final.
While the knee complaint did look to be causing him some discomfort, Del Potro still managed to take control of the match and broke fourth seed Ferrer twice to take the opening set 6-2.
The second set followed a similar pattern and the former US Open champion again found the break he was after to win the set 6-4, leaving him just a set away from the last four.
Ferrer, himself struggling with an ankle injury, continued to fight and the clay court specialist held his serve to force the third set into a tie-break.
However, the power of the no 8 seed was too much for the Spaniard and he succumbed 7-5 in the breaker, as Del Potro sealed the win at full stretch with a majestic forehand down the line.
Asked how close he was to having to concede the match, Del Potro responded: "Really close because I felt a lot of pain in the beginning of the match. It was exactly the same like I did before.
"It's really, really painful. I twisted my knee once again but the doctor gave me some magic pills so I could finish the match and I'm so glad to go through.
"I think I played my best tennis in this match. I hit really well my forehand, my serves and in the end I played my best forehand ever in this Wimbledon - I was lucky that that ball was in and I won the match."
The semi-final will be Del Potro's first at the All England Club and he is unlikely to meet a tougher opponent than Novak Djokovic, the world no 1, who he will face on Friday.
The 24-year-old will be hoping for a repeat of last year's Olympic bronze medal match in which he beat the Serb in his greatest achievement on a grass court to date.