Former Wimbledon semi-finalist Tim Henman, former Great Britain Cup captain John Lloyd, former world number 42 and BBC 5 live commentator Jeff Tarango analyse the numbers behind Andy Murray's win over Feliciano Lopez.
Murray got 56% of his first serves in compared to Lopez's 64%
Henman: "Andy Murray's first-serve percentage from his quarter-final win over Feliciano Lopez may seem low but it doesn't tell the full story.
"Sometimes, if you increase the percentage of first serves in it means that you are taking a bit of power off your serve, which gives your opponent more of a chance to return it easily, so it's important to strike a balance between getting serves in and being aggressive.
"I would like to see him increase his percentage of first serves in to over 60%, but while still making sure he is winning 85% of first serve points, as he did against Lopez.
"That would be a great combination and the sort of numbers he will need to achieve against Rafael Nadal.
"It means he should hold his serve comfortably and then he can put more pressure on the return game because he can be even more aggressive."
Lloyd: "Andy's first serve percentage of 56% was decent, but you really want it to be in the 60s.
"An 85% percentage of winning points on his first serve was excellent, but what we must consider is the quality of his opponent.
"Feliciano Lopez is not the strongest of returners so he needs that percentage to be higher against Rafael Nadal.
Murray won 65% of points on his second serve compared to Lopez's 31%
Henman: "His second serve percentage of 65% against Lopez is good, but it's flattering because Lopez doesn't really have the baseline game.
"He has still got to be aggressive on his second serves as he doesn't want to let Nadal dominate. It's about him getting this balance right. He has to be proactive and look to be aggressive."
Lloyd: "His percentage of 65% of second serves in was possibly more important as that is an area of his game he can sometimes get in trouble with.
"His second serve occasionally gets a little bit short and doesn't have much pace on it.
"He will need to take a chance and serve big rather than just spinning it in against Rafa. He can do it, he just needs to flatten it out a bit and bump it up from 80mph to nearly 100mph."
Murray won 40% of points on return compared to Lopez's 24%
Tarango: "After two days of returning against the left-handed Daniel Nestor in practice, he was used to the spin and was able to read the serve and jump out to cover it.
"For him to be able to negate the main weapon of Lopez with a great shot like that return, makes it a very easy match. Lopez is not known for his return and he was just looking to jump in once a set and steal one of Murray's service games.
"For him to do that, he needed to return very consistently, but Murray is very good at defending break points and hustling down shots.
"Lopez needed to return the best of his life to beat Murray and he just wasn't up to the challenge. He was just way too inconsistent.
"On grass, everyone says the serve is the most important shot, but I think the return is most important."
Murray converted three out of 10 break points, Lopez converted neither of his two
Tarango: "My coach used to say that if you had a thousand break points and you won just two of them, you would have won 6-3 6-4 in a two-set match.
"It doesn't mater what your percentage is. As long as you are getting your break points, it means you are doing your work to make those opportunities.
"Break points on grass are really just a roll of the dice, so the fact that he is able to get 10 break points against such a big server is really positive.
"The more opportunities you have, the less it is about nerves and more about ability. Do I think he has a problem playing the big points? No, absolutely not."