Doesn't alert, but there is an ATP-WTA phone app that has the live scoreboard just like you get off their websites if you don't have that. Works well most of the year. Glitches now and again with updating, but mostly solid.
Best app for this is called resultina....it was for free and now it's $$....but it's the best app to track players all of them over the tour including futures,challengers..etc....juniors too.....
I have been reviewing that Resultina and it is very good the first month is free and then you have to pay nine dollars per year
Whatever players you save as your favorites and get alerts pushed to your phone as soon as the match is over it's pretty quick with a nice tone
It's a great app to follow your favorite tennis players when they're playing who they're playing what type of match ups and results and pretty extensive
If you're a tennis better and/or fan I recommend this app
I've always like for most cases if I'm on the road just getting a final score you don't have to keep looking at your phone that's why this app is very good it just hits the screen phone when the matches over