Andy Murray remains wary of third round opponent Tommy Robredo after the departures of Roger Federer and Rafael Nadal from his half of the Wimbledon draw.
The world No 2 practised at Aorangi Park with 18-year-old fellow Briton Kyle Edmund, who lost in the first round to Janowicz on his senior debut in SW19 earlier this week, ahead of his next high-profile match on Friday.
Murray's progress so far has been untroubled, and the Spanish 32nd seed will be long odds to end the hopes of last year's runner-up prematurely.
The pair have met four times before, splitting the honours, but Murray won the last two and they have not faced each other since 2009.
Murray said: "He's a tough player. He had a good win against (Nicolas) Mahut, who has been playing well on the grass.
"He's very, very experienced. He's extremely fit. He won three matches in a row at the French from two sets to love down. He fights right until the last point.
"Last year he had some injury problems. When he's not injured, he's been in the top 20 in the world for a number of years. He knows how to win tennis matches. So it's a tough match for me."
Robredo, 31, had been dogged by injury problems and missed the first half of last season, including Wimbledon, sliding down to 471st in the rankings.
But he has been in excellent form this year and reached the quarter-finals of the French Open earlier this month.
The Spaniard said: "Obviously I don't like to play on grass. Sometimes in life you have to do things where you are not that comfortable. If I could change it, I would put clay on the court all the time. But here they want to play on grass."