Andy Murray insists a knee problem will not hinder his progress as he bids to defend his title at the AEGON Championship at Queen's.
Murray was given a tough examination by Spaniard Ivan Navarro as the champion edged into the third round with a 7-6 (10/8), 6-3 victory.
The world number four was pushed all the way by Navarro's serve-and-volley tactics, particularly in a hard-fought opening set.
The 28-year-old Spaniard took every opportunity to charge to the net but Murray, sporting a strapping on his right knee, produced some wonderful shots to finally see off his opponent.
"The knee is fine," said the Scot. "It's a precaution. I ice my knee after every single match I play and after every single practice. Nothing different."
Murray will now play either American Mardy Fish or Santiago Giraldo of Colombia in the third round.
"It was a tough first match," said Murray. "He (Navarro) served very, very well in the first set.
"I didn't return particularly well. It was tricky play and not what you expect from a Spaniard, coming forward on every point. It was good.
"It's nice to see someone serve and volley. I haven't played a serve and volleyer this year. This is the first time, so it was tricky and he did it very well.
"But I started returning well and had some good passing shots. You know, that's what grass court tennis is like. Quick reactions, quick reflexes."
Murray clinched the title last year to become the first British winner since 1938 and he did so without losing a set.
He came close to blotting that copybook in the first-set tie-break, despite having led 4-1. Navarro fought back and earned set point with a superb low volley at 5-4, but the British number one levelled with a vicious cross-court forehand.
Murray finally clinched the opening set 10-8 thanks to a cross-court double-handed backhand on the world number 108's serve.
"I played a sort of sharp slice and he came forward," added Murray. "It was just kind of instant. He was covering the line and I got a good hit on it.
"I saw a lot of the players slipping the first couple of days in the matches I was watching. I thought I moved pretty well. It didn't feel too slippery to me. I hit the ball well from back of the court once I got into the rallies."
Murray was followed on court by last year's Wimbledon runner-up Andy Roddick who took just 50 minutes to see off the challenge of Russian Igor Kunitsyn 6-2 6-1.
Gael Monfils crashed out, though, beaten 6-3 6-7 6-2 by Germany's Rainer Schuettler in a rain-affected match.
Winning the previous match on centre court was Grigor Dimitrov, who won five of the seven games he played against Alex Bogdanovic in the resumption of their third set to triumph 4-6 6-3 6-4.
France's Richard Gasquet beat American Rajeev Ram 6-3 7-5, American Mardy Fish beat Somdev Devvarman 6-1 6-4 and French qualifier Nicolas Mahut defeated Yen-Hsun Lu 7-6 6-4.
Andy and Jamie Murray eased into the quarter-finals of the doubles with a comfortable straight-sets victory over Americans Scott Lipsky and Sam Querrey. It was the first time the pair had played together since 2008.
Andy Murray added: "The doubles was very good. Jamie played very well. I thought I played well."