For you guys that like podcasts, "Under Review" is a great one for tennis. One of the most recent was with Roman Prokes, racquet customizer to several past and present big time players. He had some really interesting comments on playing style trends and equipment. He worked with Djoker on his racquet change last year when he went longer, lighter and opened up his string pattern a little bit. He said Novak had specific shot and opponent in mind when considering the change. Prokes talked a lot about the trend of players going lighter so they could swing faster, generate more spin and open up the court with aggressive angles. Some other tidbits; his favorite string is Solinco Hyper G. He worked with Tiafoe and changed his handle from the standard Yonex to a Head, rectangular shape because Tiafoe was having trouble finding his backhand grip on grip changes. Tiafoe plays his VCore 97 310 at 311g unstrung. The player he's worked with on the men's side with the lighest racquet, Taylor Fritz at 295g unstrung!