The serve ratings are basically one sequence of numbers. In the rulebook, David Ferrer on Grass is 0-5 WIN, 6-73 1st Serve, 74-99 2nd Serve. So, let's say he's the favorite and rolls on the Event Chart, Favorite. Here he rolls a 5: 2nd Serve +5. His 2nd Serve rating changes to 79-99 (meaning the 1st Serve is now 6-78).