Kyle Edmund believes Jerzy Janowicz has a good chance of beating Andy Murray in the Wimbledon semi-finals today.
British teenager Edmund was Janowicz's first victim on his run at the All England Club, the 18-year-old managing eight games against his giant opponent.
At 6ft 8in, Janowicz is certainly not a player who can be taken lightly, and Edmund believes Murray's returns off the Pole's 140mph serves will be key.
"Andy has got to return well, which he does anyway," said Edmund, who is through to the semi-finals of the boys' singles.
"When I played him the main objective was to keep the ball in play, and when it did go in play his forehand and backhand were very good and he was just swinging.
"He has such a good game. Andy knows his abilities and what he can do with the ball but Janowicz is playing well.
"He is a danger. He was a danger at the start of the tournament. It was a tough draw and he has shown why by reaching the semis.
"You have to be playing well. He obviously has a good chance (against Murray)."
Janowicz is the biggest beneficiary of the early exits of Roger Federer and Rafael Nadal.
The quarter-final in that section of the draw was supposed to be between the two superstars of the men's game, but instead history was made as two Polish players met at that stage for the first time in a grand slam.
Janowicz defeated compatriot Lukasz Kubot to become the first male Polish semi-finalist at a slam, an achievement that reduced the big man to tears.
He said: "I'm really proud to represent my country. Always I'm happy to play a Davis Cup tie. I haven't missed even one match from 2008. So this is really important for me."
Janowicz and Murray have met twice before, with the Scot winning a Davis Cup rubber in 2009 but beaten in Paris last November.
The Masters event at Paris Bercy was Janowicz's real breakthrough. But reaching a Wimbledon semi-final has surpassed that for the 22-year-old, who said as he reflected on his win over Kubot: "Right now I'm the most happy person in the world.
"I made the semi-final of a grand slam, my best result ever. Also I have in my mind last year Paris Bercy. I was there in the final.
"But this is a little bit different situation. This is a grand slam."