Peter too wrote:

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Can't help thinking that some of the girls might benefit from a service coach. In the Blake Raina match for example there have been 8 games that went against service and only 2 went with service.

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 This is a constant problem and poses many interesting points

Firstly, women's service problems are true right up to the very top end of the game - the last stats I saw when working was that top men hold serve about 77% of the time, whereas top women hold serve about 65%

If you go further down the rankings, the difference is more marked - women generally in ITF 25ks are about 50%, I believe.

Women who are shorter often (but not always) have trouble with holding serve. Height and arm length help a lot with pace and trajectory. Strength comes into it too. 

Also, women have a far better return game than serve - the return is very like their normal, driven ground shots, and hence is something that is more mastered (unlike serves which have so many quirks, and unusual actions).

It doesn't necessarily mean that the serves are weak or that service coaching will help - indeed, one argument in coaching is to work even more on the return, because that's easier to improve even further. Similarly, women work hard on the third shot of the rally i.e. they serve, the return comes, and they work on that next shot - being ready to move, using their legs to absorb the pace etc etc - they know the serve is not strong, they know they'll get a strong return, so work on the return of the return 

Not saying they shouldn't work on their serve too, of course 

Angelica finally took the 1st set tie break against Raina 7-6(4)