When it comes to buying a new racket there are a lot of things to look for, I am here to discuss string pattern with you. Pros and cons of the 18x20 less spin less power more control better feel recommended for advanced tennis players (3.5+) requires more muscle Pros and cons of the 16x19/18 more spin adequate power less feel less control easier to use and good for intermediate and beginners less muscle What about the 18x16 or other spin patterns? These are less common and harder to find they offer more spin and depth but aren't too offensive, they are more for baseliners. Few players use spin patterns one is Grigor Dimitrov who uses an all out 15x16 spin pattern. The problem with spin patterns are the strings move around a lot and break easier so you have to use either a hybrid pattern or synthetic string so it breaks less.