Tim Henman highlighted the improvement in Andy Murray's game after losing to the Scot at the Toronto Masters.
Murray will face Carlos Moya in the third round in Toronto
Murray takes on Carlos Moya in the third round at 1800 BST on Thursday, having beaten Henman 6-2 7-6 (8-6).
Henman, who also lost their first meeting in Basle last year, said: "He's definitely come a long way since then.
"He's much more experienced. He's adding to his game, getting a little bit more aggressive. I think he's a lot more confident."
Murray began working with new coach Brad Gilbert last week in Washington and reached the final there, before seeing off 12th seed David Ferrer and Henman this week in Toronto.
"He's obviously having a good couple of weeks the last few weeks," said Henman. "I'm sure he's going to be keen to keep building on that."
You just have to try and do your job, try not to think about who you're playing against
Murray, 19, admitted it had been difficult to play a against a friend and someone he had looked up to as a junior.
"It is difficult because he's a good friend of mine, someone that's helped me a lot," said Murray. "He's given me good advice.
"To go out and try to beat them, beat them badly, isn't the easiest thing to do, but tennis players have to put that out of our mind.
"The French guys, they play against each other all the time, and they're good friends. You've got nine or 10 of them in this tournament.
"It doesn't happen to us too often. But when you do, you just have to try and do your job, try not to think about who you're playing against."
Moya has beaten Gaston Gaudio and Denis Gremelmayr on his way to the last 16 and Murray expects a tough match.
"He's one of the top ten players from the last seven to eight years," said Murray.
"He's got a lot more experience than me, and a huge forehand. I'm sure he's going to be feeling confident going into the match."